\r\n\tAnimal food additives are products used in animal nutrition for purposes of improving the quality of feed or to improve the animal’s performance and health. Other additives can be used to enhance digestibility or even flavour of feed materials. In addition, feed additives are known which improve the quality of compound feed production; consequently e.g. they improve the quality of the granulated mixed diet.
\r\n\r\n\tGenerally feed additives could be divided into five groups:
\r\n\t1.Technological additives which influence the technological aspects of the diet to improve its handling or hygiene characteristics.
\r\n\t2. Sensory additives which improve the palatability of a diet by stimulating appetite, usually through the effect these products have on the flavour or colour.
\r\n\t3. Nutritional additives, such additives are specific nutrient(s) required by the animal for optimal production.
\r\n\t4.Zootechnical additives which improve the nutrient status of the animal, not by providing specific nutrients, but by enabling more efficient use of the nutrients present in the diet, in other words, it increases the efficiency of production.
\r\n\t5. In poultry nutrition: Coccidiostats and Histomonostats which widely used to control intestinal health of poultry through direct effects on the parasitic organism concerned.
\r\n\tThe aim of the book is to present the impact of the most important feed additives on the animal production, to demonstrate their mode of action, to show their effect on intermediate metabolism and heath status of livestock and to suggest how to use the different feed additives in animal nutrition to produce high quality and safety animal origin foodstuffs for human consumer.
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Kardia",authors:[{id:"71649",title:"Dr.",name:"Jennifer",middleName:null,surname:"Smith",fullName:"Jennifer Smith",slug:"jennifer-smith"},{id:"120121",title:"Dr.",name:"Stephen",middleName:null,surname:"Turner",fullName:"Stephen Turner",slug:"stephen-turner"},{id:"120122",title:"Dr.",name:"Sharon",middleName:null,surname:"Kardia",fullName:"Sharon Kardia",slug:"sharon-kardia"},{id:"120123",title:"Dr.",name:"Thomas",middleName:null,surname:"Mosley",fullName:"Thomas Mosley",slug:"thomas-mosley"}]},{id:"33532",title:"Compensatory Neurogenesis in the Injured Adult Brain",slug:"compensatory-neurogenesis-in-the-injured-adult-brain",signatures:"Bronwen Connor",authors:[{id:"68538",title:"Dr.",name:"Bronwen",middleName:null,surname:"Connor",fullName:"Bronwen Connor",slug:"bronwen-connor"}]},{id:"33533",title:"The Effects of Melatonin on Brain Injury in Acute Organophosphate Toxicity",slug:"the-effects-of-melatonin-on-brain-injury-in-acute-organophosphate-toxicity",signatures:"Aysegul Bayir",authors:[{id:"71110",title:"Prof.",name:"Aysegul",middleName:null,surname:"Bayir",fullName:"Aysegul Bayir",slug:"aysegul-bayir"}]},{id:"33534",title:"Alzheimer's Factors in Ischemic Brain Injury",slug:"alzheimer-s-factors-in-ischemic-brain-injury",signatures:"Ryszard Pluta and Mirosław Jabłoński",authors:[{id:"69204",title:"Prof.",name:"Ryszard",middleName:null,surname:"Pluta",fullName:"Ryszard Pluta",slug:"ryszard-pluta"}]},{id:"33535",title:"The Leukocyte Count, Immature Granulocyte Count and Immediate Outcome in Head Injury Patients",slug:"the-leukocyte-count-immature-granulocyte-count-and-immediate-outcome-in-head-injury-patients",signatures:"Arulselvi Subramanian, Deepak Agrawal, Ravindra Mohan Pandey, Mohita Nimiya and Venencia Albert",authors:[{id:"68589",title:"Dr.",name:"Arulselvi",middleName:"---",surname:"Subramanian",fullName:"Arulselvi Subramanian",slug:"arulselvi-subramanian"},{id:"77003",title:"Prof.",name:"Ravindra Mohan",middleName:null,surname:"Pandey",fullName:"Ravindra Mohan Pandey",slug:"ravindra-mohan-pandey"},{id:"77004",title:"Dr.",name:"Deepak",middleName:null,surname:"Agrawal",fullName:"Deepak Agrawal",slug:"deepak-agrawal"},{id:"77011",title:"Ms.",name:"Mohita",middleName:null,surname:"Nimiya",fullName:"Mohita Nimiya",slug:"mohita-nimiya"},{id:"77103",title:"Ms.",name:"Venencia",middleName:null,surname:"Albert",fullName:"Venencia Albert",slug:"venencia-albert"}]},{id:"34006",title:"Animal Models of Retinal Ischemia",slug:"animal-models-of-retinal-ischemia",signatures:"Gillipsie Minhas and Akshay Anand",authors:[{id:"81498",title:"Dr.",name:"Akshay",middleName:null,surname:"Anand",fullName:"Akshay Anand",slug:"akshay-anand"}]},{id:"33536",title:"Cerebral Blood Flow in Experimental and Clinical Neurotrauma: Quantitative Assessment",slug:"cerebral-blood-flow-in-experimental-and-clinical-neurotrauma-quantitative-assessment",signatures:"Hovhannes M. Manvelyan",authors:[{id:"71210",title:"Prof.",name:"Hovhannes",middleName:"M",surname:"Manvelyan",fullName:"Hovhannes Manvelyan",slug:"hovhannes-manvelyan"}]},{id:"33537",title:"MRI Characterization of Progressive Brain Alterations After Experimental Traumatic Brain Injury: Region Specific Tissue Damage, Hemodynamic Changes and Axonal Injury",slug:"mri-characterization-of-progressive-brain-alterations-after-experimental-traumatic-brain-injury-regi",signatures:"Riikka Immonen and Nick Hayward",authors:[{id:"79512",title:"Dr.",name:"Riikka",middleName:null,surname:"Immonen",fullName:"Riikka Immonen",slug:"riikka-immonen"},{id:"79752",title:"Dr.",name:"Nick",middleName:null,surname:"Hayward",fullName:"Nick Hayward",slug:"nick-hayward"}]},{id:"33538",title:"Neurointensive Care Monitoring for Severe Traumatic Brain Injury",slug:"neurointensive-care-monitoring-for-severe-traumatic-brain-injury",signatures:"Zamzuri Idris, Muzaimi Mustapha and Jafri Malin Abdullah",authors:[{id:"42580",title:"Prof.",name:"Jafri",middleName:"Malin",surname:"Abdullah",fullName:"Jafri Abdullah",slug:"jafri-abdullah"},{id:"73844",title:"Prof.",name:"Zamzuri",middleName:null,surname:"Idris",fullName:"Zamzuri Idris",slug:"zamzuri-idris"},{id:"76920",title:"Dr.",name:"Muzaimi",middleName:null,surname:"Mustapha",fullName:"Muzaimi Mustapha",slug:"muzaimi-mustapha"}]},{id:"33539",title:"The Dynamic Visualization Technology in Brain Deceleration Injury Research",slug:"the-dynamic-visualization-technology-in-brain-deceleration-injury-research",signatures:"Zhiyong Yin, Shengxiong Liu, Daiqin Tao and Hui Zhao",authors:[{id:"75320",title:"Prof.",name:"Zhiyong",middleName:null,surname:"Yin",fullName:"Zhiyong Yin",slug:"zhiyong-yin"},{id:"80074",title:"Dr",name:"Daiqin",middleName:null,surname:"Tao",fullName:"Daiqin Tao",slug:"daiqin-tao"},{id:"80075",title:"Dr.",name:"Daiqin",middleName:null,surname:"Tao",fullName:"Daiqin Tao",slug:"daiqin-tao"},{id:"80076",title:"Dr.",name:"Hui",middleName:null,surname:"Zhao",fullName:"Hui Zhao",slug:"hui-zhao"}]},{id:"33540",title:"The Experimental Technology on the Brain Impact Injuries",slug:"the-experimental-technology-on-the-brain-impact-injuries",signatures:"Zhiyong Yin, Hui Zhao, Daiqin Tao and Shengxiong Liu",authors:[{id:"75320",title:"Prof.",name:"Zhiyong",middleName:null,surname:"Yin",fullName:"Zhiyong Yin",slug:"zhiyong-yin"}]},{id:"33541",title:"Towards Non-Invasive Bedside Monitoring of Cerebral Blood Flow and Oxygen Metabolism in Brain-Injured Patients with Near-Infrared Spectroscopy",slug:"towards-non-invasive-bedside-monitoring-of-cerebral-blood-flow-and-oxygen-metabolism-in-brain-injure",signatures:"Mamadou Diop, Jonathan T. Elliott, Ting-Yim Lee and Keith St. Lawrence",authors:[{id:"74691",title:"Dr.",name:"Mamadou",middleName:null,surname:"Diop",fullName:"Mamadou Diop",slug:"mamadou-diop"},{id:"79604",title:"Dr.",name:"Keith",middleName:null,surname:"St Lawrence",fullName:"Keith St Lawrence",slug:"keith-st-lawrence"},{id:"127518",title:"BSc.",name:"Jonathan T.",middleName:null,surname:"Elliott",fullName:"Jonathan T. Elliott",slug:"jonathan-t.-elliott"},{id:"127519",title:"Dr.",name:"Ting-Yim",middleName:null,surname:"Lee",fullName:"Ting-Yim Lee",slug:"ting-yim-lee"}]},{id:"33542",title:"Mechanisms of Neuroprotection Underlying Physical Exercise in Ischemia - Reperfusion Injury",slug:"mechanisms-of-neuroprotection-underlying-physical-exercise-in-ischemia-reperfusion-injury",signatures:"David Dornbos III and Yuchuan Ding",authors:[{id:"90244",title:"Dr.",name:"Yuchuan",middleName:null,surname:"Ding",fullName:"Yuchuan Ding",slug:"yuchuan-ding"},{id:"119759",title:"Dr.",name:"David III",middleName:null,surname:"Dornbos",fullName:"David III Dornbos",slug:"david-iii-dornbos"}]},{id:"33543",title:"Physiological Neuroprotective Mechanisms in Natural Genetic Systems: Therapeutic Clues for Hypoxia-Induced Brain Injuries",slug:"physiological-neuroprotective-mechanisms-in-natural-genetic-systems-therapeutic-clues-for-hypoxia-in",signatures:"Thomas I Nathaniel, Francis Umesiri, Grace Reifler, Katelin Haley, Leah Dziopa, Julia Glukhoy and Rahul Dani",authors:[{id:"72811",title:"Dr.",name:"Thomas",middleName:null,surname:"Nathaniel",fullName:"Thomas Nathaniel",slug:"thomas-nathaniel"},{id:"120671",title:"Dr.",name:"Francis",middleName:"E",surname:"Umesiri",fullName:"Francis Umesiri",slug:"francis-umesiri"},{id:"120672",title:"Dr.",name:"Katelin",middleName:null,surname:"Michele Haley",fullName:"Katelin Michele Haley",slug:"katelin-michele-haley"},{id:"120673",title:"Dr.",name:"Leah",middleName:null,surname:"Dziopa",fullName:"Leah Dziopa",slug:"leah-dziopa"},{id:"120674",title:"Dr.",name:"Julia",middleName:null,surname:"Glukhoy",fullName:"Julia Glukhoy",slug:"julia-glukhoy"},{id:"120675",title:"Dr.",name:"Rahul",middleName:null,surname:"Dani",fullName:"Rahul Dani",slug:"rahul-dani"}]},{id:"33544",title:"Competing Priorities in the Brain Injured Patient: Dealing with the Unexpected",slug:"competing-priorities-in-the-brain-injured-patient-dealing-with-the-unexpected",signatures:"Jonathan R. Wisler, Paul R. Beery II, Steven M. Steinberg and Stanislaw P. A. Stawicki",authors:[{id:"59801",title:"Prof.",name:"Johathan",middleName:null,surname:"Wisler",fullName:"Johathan Wisler",slug:"johathan-wisler"},{id:"136717",title:"Dr.",name:"Steven",middleName:null,surname:"Steinberg",fullName:"Steven Steinberg",slug:"steven-steinberg"},{id:"136718",title:"Dr.",name:"Paul",middleName:null,surname:"Beery 2nd",fullName:"Paul Beery 2nd",slug:"paul-beery-2nd"},{id:"181694",title:"Dr.",name:"Stanislaw P.",middleName:null,surname:"Stawicki",fullName:"Stanislaw P. Stawicki",slug:"stanislaw-p.-stawicki"}]},{id:"33545",title:"Traumatic Brain Injury - Acute Care",slug:"traumatic-brain-injury-acute-care",signatures:"Angela N. Hays and Abhay K. Varma",authors:[{id:"78122",title:"Dr.",name:"Abhay",middleName:null,surname:"Varma",fullName:"Abhay Varma",slug:"abhay-varma"},{id:"80085",title:"Dr.",name:"Angela",middleName:null,surname:"Hays",fullName:"Angela Hays",slug:"angela-hays"}]},{id:"33546",title:"Clinical Neuroprotection Against Tissue Hypoxia During Brain Injuries; The Challenges and the Targets",slug:"clinical-neuroprotection-against-tissue-hypoxia-during-brain-injuries-the-challenges-and-the-targets",signatures:"Thomas I Nathaniel, Effiong Otukonyong, Sarah Bwint, Katelin Haley, Diane Haleem, Adam Brager and Ayotunde Adeagbo",authors:[{id:"72811",title:"Dr.",name:"Thomas",middleName:null,surname:"Nathaniel",fullName:"Thomas Nathaniel",slug:"thomas-nathaniel"},{id:"82656",title:"Dr.",name:"Diane",middleName:null,surname:"Haleem",fullName:"Diane Haleem",slug:"diane-haleem"},{id:"82658",title:"Mr.",name:"Adam",middleName:null,surname:"Brager",fullName:"Adam Brager",slug:"adam-brager"},{id:"82661",title:"Dr.",name:"Effiong",middleName:null,surname:"Otukonyong",fullName:"Effiong Otukonyong",slug:"effiong-otukonyong"}]},{id:"33547",title:"Antioxidant Treatments: Effect on Behaviour, Histopathological and Oxidative Stress in Epilepsy Model",slug:"antioxidant-treatments-effect-on-behaviour-histopathological-and-oxidative-stress-in-epilepsy-model",signatures:"Rivelilson Mendes de Freitas",authors:[{id:"68412",title:"Dr.",name:"Rivelilson Mendes",middleName:null,surname:"De Freitas",fullName:"Rivelilson Mendes De Freitas",slug:"rivelilson-mendes-de-freitas"}]},{id:"33548",title:"Growth Hormone and Kynesitherapy for Brain Injury Recovery",slug:"growth-hormone-and-kynesitherapy-for-brain-injury-recovery",signatures:"Jesús Devesa, Pablo Devesa, Pedro Reimunde and Víctor Arce",authors:[{id:"68521",title:"Prof.",name:"Jesús",middleName:null,surname:"Devesa",fullName:"Jesús Devesa",slug:"jesus-devesa"},{id:"122069",title:"Dr.",name:"Pablo",middleName:null,surname:"Devesa",fullName:"Pablo Devesa",slug:"pablo-devesa"},{id:"122070",title:"Dr.",name:"Pedro",middleName:null,surname:"Reimunde",fullName:"Pedro Reimunde",slug:"pedro-reimunde"},{id:"122071",title:"Prof.",name:"Víctor",middleName:null,surname:"Arce",fullName:"Víctor Arce",slug:"victor-arce"}]},{id:"33549",title:"Novel Strategies for Discovery, Validation and FDA Approval of Biomarkers for Acute and Chronic Brain Injury",slug:"novel-strategies-for-discovery-validation-and-fda-approval-of-biomarkers-for-acute-and-chronic-brain",signatures:"S. Mondello, F. H. Kobeissy, A. Jeromin, J. D. Guingab-Cagmat, Z. Zhiqun, J. Streeter, R. L. Hayes and K. K. Wang",authors:[{id:"76890",title:"Prof.",name:"Ronald",middleName:null,surname:"Hayes",fullName:"Ronald Hayes",slug:"ronald-hayes"}]},{id:"33550",title:"Decompressive Craniectomy: Surgical Indications, Clinical Considerations and Rationale",slug:"decompressive-craniectomy-surgical-indications-clinical-considerations-and-rationale",signatures:"Dare Adewumi and Austin Colohan",authors:[{id:"80010",title:"Dr.",name:"Austin",middleName:null,surname:"Colohan",fullName:"Austin Colohan",slug:"austin-colohan"},{id:"126027",title:"Dr.",name:"Dare",middleName:null,surname:"Adewumi",fullName:"Dare Adewumi",slug:"dare-adewumi"}]},{id:"33551",title:"The Role of Decompressive Craniectomy in the Management of Patients Suffering Severe Closed Head Injuries",slug:"the-role-of-decompressive-craniectomy-in-the-management-of-patients-suffering-severe-closed-head-inj",signatures:"Haralampos Gatos, Eftychia Z. Kapsalaki, Apostolos Komnos Konstantinos N. Paterakis and Kostas N. Fountas",authors:[{id:"51986",title:"Prof.",name:"Kostas",middleName:"N.",surname:"Fountas",fullName:"Kostas Fountas",slug:"kostas-fountas"},{id:"60034",title:"Dr.",name:"Eftychia",middleName:null,surname:"Kapsalaki",fullName:"Eftychia Kapsalaki",slug:"eftychia-kapsalaki"},{id:"80000",title:"Dr.",name:"Konstantinos",middleName:null,surname:"Paterakis",fullName:"Konstantinos Paterakis",slug:"konstantinos-paterakis"},{id:"80001",title:"Dr.",name:"Harlambos",middleName:null,surname:"Gatos",fullName:"Harlambos Gatos",slug:"harlambos-gatos"},{id:"80002",title:"Dr.",name:"Apostolos",middleName:null,surname:"Komnos",fullName:"Apostolos Komnos",slug:"apostolos-komnos"}]},{id:"33552",title:"The Importance of Restriction from Physical Activity in the Metabolic Recovery of Concussed Brain",slug:"the-importance-of-restriction-from-physical-activity-in-the-metabolic-recovery-of-concussed-brain",signatures:"Giuseppe Lazzarino, Roberto Vagnozzi, Stefano Signoretti, Massimo Manara, Roberto Floris, Angela M. Amorini, Andrea Ludovici, Simone Marziali, Tracy K. McIntosh and Barbara Tavazzi",authors:[{id:"72175",title:"Prof.",name:"Giuseppe",middleName:null,surname:"Lazzarino",fullName:"Giuseppe Lazzarino",slug:"giuseppe-lazzarino"},{id:"79828",title:"Prof.",name:"Roberto",middleName:null,surname:"Vagnozzi",fullName:"Roberto Vagnozzi",slug:"roberto-vagnozzi"},{id:"79830",title:"Dr.",name:"Massimo",middleName:null,surname:"Manara",fullName:"Massimo Manara",slug:"massimo-manara"},{id:"79831",title:"Prof.",name:"Barbara",middleName:null,surname:"Tavazzi",fullName:"Barbara Tavazzi",slug:"barbara-tavazzi"},{id:"79832",title:"Prof.",name:"Roberto",middleName:null,surname:"Floris",fullName:"Roberto Floris",slug:"roberto-floris"},{id:"79833",title:"Dr.",name:"Angela Maria",middleName:null,surname:"Amorini",fullName:"Angela Maria Amorini",slug:"angela-maria-amorini"},{id:"79834",title:"Dr.",name:"Stefano",middleName:null,surname:"Signoretti",fullName:"Stefano Signoretti",slug:"stefano-signoretti"},{id:"79835",title:"Dr.",name:"Andrea",middleName:null,surname:"Ludovici",fullName:"Andrea Ludovici",slug:"andrea-ludovici"},{id:"120385",title:"Dr.",name:"Simone",middleName:null,surname:"Marziali",fullName:"Simone Marziali",slug:"simone-marziali"},{id:"120386",title:"Prof.",name:"Tracy K",middleName:null,surname:"McIntosh",fullName:"Tracy K McIntosh",slug:"tracy-k-mcintosh"}]}]}]},onlineFirst:{chapter:{type:"chapter",id:"63317",title:"Plasma-Enabled Dry Methane Reforming",doi:"10.5772/intechopen.80523",slug:"plasma-enabled-dry-methane-reforming",body:'Dry methane reforming (DMR) has drawn keen attention as viable CO2 utilization technology because it may have one of the greatest commercial potentials [1, 2].
Moreover, products are the main components of syngas (H2 and CO), which can be converted to the synthetic fuels as well as H2 carrier via well-established C1 chemistry. Conventionally, the H2/CO ratio from DMR is more suitable for Fischer-Tropsch synthesis than other methane reforming reactions [3, 4, 5]. Figure 1 shows the reaction enthalpy and Gibbs free energy of DMR (R1) with respect to temperature. According to the definition, reaction enthalpy (Eq. (1)) consists of two terms:
Energy diagram of DMR.
DMR is categorized as uphill (endothermic) reaction where energy input (ΔH) is indispensable in order to satisfy the conservation of energy. Moreover, the reaction does not occur spontaneously by the low-temperature thermal energy due to the large positive value of ΔG at low temperature. Figure 1 shows that at least 900 K is required to have a negative value of ΔG, and all energy is supplied via high-temperature thermal energy. Such high-temperature heat is supplied by the combustion of initial feed that produces CO2 as well as NOx. Net CO2 utilization is partly canceled unless combustion-generated CO2 is utilized which is economically quite difficult. Moreover, heat transfer from the combustion gas flowing outside of the reactor to the catalyst bed governs the overall material throughput which is known as a heat transfer-limiting regime. Because the heat transport property of a fixed bed reactor is poor, excessively high-temperature operation beyond thermodynamic limitation (i.e., 900 K) is necessary.
To overcome the aforementioned problem, low-temperature DMR is demanded, pursuing a new technology, and potential use of nonthermal plasma is highlighted. Assume DMR is operated at a lower temperature than the thermodynamic limitation as schematically depicted in Figure 1. A part of the energy is supplied by a low-temperature thermal energy (TΔS), while the rest of energy is supplied by the electricity (ΔG) under the nonthermal plasma environment so that TΔS + ΔG satisfies reaction enthalpy (ΔH). Electrical energy is used to accelerate electrons; subsequently, the electron energy is transferred to the molecules to initiate DMR at much lower temperature than thermal catalysis. Electronic collision process is independent of reaction temperature if gas density does not change significantly. Meanwhile, a part of the electrical energy is converted to heat: electrical energy consumed by nonthermal plasma (E) is depicted in the dashed line in Figure 1: inevitably, E is greater than ΔG at a fixed temperature. Although heat generated by nonthermal plasma is considered as energy loss (i.e., E−ΔG), both excited species and heat are utilized via endothermic DMR, which enables efficient use of electrical energy without heat transfer limitation: electrification of reforming reaction, or chemical processes in general, has the greatest advantage that the energy transfer and the control are independent of temperature gradient.
Dielectric barrier discharge (DBD) is the most successful atmospheric pressure nonthermal plasma sources in industry applications [6] and is used exclusively for this purpose. DBD is combined with a catalyst bed reactor and generated at atmospheric pressure [7]. DBD is characterized as a number of transient discharge channels known as streamers with nanosecond duration. Because the streamer has a nature of propagation along the interface between two adjacent dielectric materials, namely, the catalyst pellet and the gas interface, excited species produced by DBD is transferred to the catalyst surface efficiently. Moreover, the heat generated by DBD is transferred directly to the catalysts; overall energy transfer from nonthermal plasma to the catalyst bed is efficient. If the electricity is supplied from the renewable energy such as photovoltaics and wind turbines, low-emission DMR is possible with free of combustion. Moreover, nonthermal plasma-assisted C1 chemistry enables renewable-to-chemical energy conversion, which provides an alternative and viable solution for the efficient renewable energy storage and transportation pathways.
The aforementioned thermodynamic analysis (Figure 1) implies that the temperature-benign and low-emission chemical processes are possible with the appropriate combination of nonthermal plasma and the heterogeneous catalysts. Meanwhile, such hybrid system does not work at room temperature simply because the overall reaction rate is kinetically controlled at much low temperature: Nevertheless, we would like to highlight that nonthermal plasma technology solves many technological obstacles such as the elimination of combustion as well as heat transfer limitation. Moreover, low-temperature operation suppresses coke formation which is one of the big issues in DMR. In this book chapter, we focus on low-temperature DMR and compare thermal and plasma catalysis. Plasma catalysis of DMR was diagnosed by pulsed reaction spectrometry [8], and results were compared with thermal catalysis to highlight the benefit of DBD and catalyst combination. Subsequently, the interaction between DBD and catalyst pellets was discussed toward deeper insight into the mechanism. Finally, future prospects of plasma catalysis of DMR are provided.
Based on the location and number of plasma zone and catalyst bed, the combination of heterogeneous catalysts with plasma can be operated in three configurations: single-, two- and multistage, which are shown in Figure 2.
Schematic diagram of single-stage (a), two-stage (b), and multistage reactor (c). Catalyst is depicted as orange circle; plasma is depicted as purple “lightning” symbol.
In a single-stage reactor (Figure 2(a)), the catalyst is packed inside the plasma zone, where the interaction of plasma and catalysts occurs. Because thermal plasma (gas bulk temperature >3000°C [9]) could damage catalyst, single-stage reactor is, therefore, suitable for nonthermal plasma sources. The single-stage reactor is widely applied in CH4 reforming [10, 11, 12, 13, 14], direct conversion of CO2 [15, 16, 17, 18, 19], VOCs abatement [20, 21, 22], exhaust matter removal [23], formaldehyde removal [24], NOx synthesis [25], and ozone synthesis [6]. There are two significant merits of single-state reactor: (I) great flexibility exists in terms of electrode and reactor configurations that the reactor can be constructed using inexpensive materials such as glass and polymers and (II) reactive species, ions, electrons, etc. generated by nonthermal plasma could modify the gas composition, which affects the surface reactions with catalyst synergistically. However, the interaction between plasma and catalyst is complex when the catalyst is placed directly in the plasma zone. The synergy of plasma and catalyst will be discussed further in Section 4 based on the single-state reactor.
Figure 3 depicts a single-stage DBD reactor for CH4 reforming [26], mainly including a quartz tube reactor, high voltage (HV) electrode at the center, and ground electrode outside of the tube. Catalyst pellets are packed in the plasma zone between two electrodes, and both ends of the catalyst bed are fixed by metallic supports. The high voltage is applied between the HV centered electrode and ground electrode to generate dielectric barrier discharge over the pellet surface. Discharge power was measured by voltage-charge Lissajous analysis. The discharge gap, which is the distance between HV electrode and the ground electrode, is usually less than 10 mm [27]. Catalyst temperature is controlled by a furnace. The temperature distribution of the catalyst bed is measured by thermography through the observation window. Figure 3(c)–(e) shows an overview of the catalyst bed, DBD generated in the catalyst bed, and the temperature distribution during reforming reaction. The catalyst bed temperature was clearly decreased because of the endothermic nature of DMR. In addition, gas temperature was estimated by optical emission spectroscopy (OES) of CO(B-A) transition [28], showing that catalyst temperature and gas temperature matched within a measurement error.
Single-stage DBD reactor system for DMR: (a) overview of the reactor system, (b) cross-sectional view, (c) overview of the catalyst bed, (d) DBD generated in the catalyst bed, and (e) temperature distribution during reforming reaction.
In the two-stage reactor, the catalyst is located at the downstream of plasma (Figure 2(b)). The gas is first addressed by the plasma and subsequently interacts with the catalyst [29]. Due to the separation of plasma and catalyst, both thermal and nonthermal plasma can be utilized. Because excited species generated in plasma have very short lifetimes, plasma mainly plays the role to preconvert the gas composition and then feed it into the catalyst reactor, e.g., in NOx removal process, due to the pretreatment of plasma, NO and NO2 were coexisted, which enhanced the following selective catalytic reduction in catalyst bed [30]; the other example is the benzene removal process where ozone (O3) was formed from background O2 by plasma, which promoted the decomposition of benzene in the next stage [31]. However, compared with the single-stage reactor, application of a two-stage reactor is limited in plasma catalysis and shows a lower performance for a given catalyst [32, 33, 34, 35, 36, 37].
The multistage reactor can be described as a combination of more than one single-stage bed/reactor (Figure 2(c)). The multistage reactor gives a more flexible option in the industrialization of the plasma catalysis, attributing to the combination of catalysts with a different function for the expected reaction [38]. Chavade et al. [39] used a four-stage plasma and catalytic reactor system for oxidation of benzene. The results showed that the increase in stage number enhanced benzene conversion and CO2 selectivity. The same result can be found in biogas reforming process using a multistage gliding arc discharge system without catalyst [40]. Harling et al. [41] developed a three-stage reactor for VOCs removal. The combination of plasma and catalyst in series could significantly improve the efficiency of VOCs decomposition. At the same time, the formation of by-product such as NOx was suppressed.
The pulsed reaction spectrometry using DBD with Ni/Al2O3 catalysts was investigated to develop a reforming diagnostic method [10]. Pulsed reforming enables the transient analyses of both CH4/CO2 consumption and H2 and CO generation. Furthermore, carbon formation was analyzed quantitatively without serious catalyst deactivation. The varied CH4/CO2 ratios between 0.5 and 1.5 were investigated at a fixed catalyst temperature near 600°C. The CH4/CO2 ratio was initially set to 0.5, and then the CH4/CO2 ratio was incremented stepwise until CH4/CO2 = 1.5, consecutively, while total flow rate was fixed at 1000 cm3/min. De-coking process (R2) was followed up after every pulsed reaction. System pressure was kept at 5 kPa during the reforming process. Discharge power was 85−93 W where specific energy input was ca. 1.2 eV/molecule. Commercially available catalyst pellets (11 wt% Ni-La/Al2O3, Raschig ring type: 3 mm) was packed for 40 mm length (total weight ca. 12 g; Ni 1.36 g; La 0.35 g). Figure 4 provides an overview of gas component changes in the entire hybrid reforming.
Overview of the entire pulsed hybrid DMR.
Reactant conversion and product yields are shown in Figure 5. The definition for conversion and yield were provided in Ref. [8]. CH4 conversion and H2 yield were monotonically increased with the CH4/CO2 ratio. There are two simultaneous routes for CH4 conversion as shown in Figure 6. Route (I) is a reforming path: CH4 is chemisorbed on metallic sites (adsorbed species are denoted by * in reaction). The adsorbed CH4 fragments (CHx*) is oxidized by CO2* to form CHxO* before complete dehydrogenations to C* occurs. In route (II), CH4 almost irreversibly dehydrogenates toward carbon atom, and then C*-rich layer is oxidized slowly by CO2* (R2), which can be evidenced in the de-coking process in Figure 4. When the CH4/CO2 ratio exceeded 1.0, CH4 prefers to dehydrogenate to solid carbon through route (II) due to the low proportion of CO2. Subsequently, a nonnegligible amount of solid carbon is produced, and CO2 conversion and CO yield turned to proportionally decrease.
Effects of CH4/CO2 ratio on DMR at ca. 600°C: (a) CH4 conversion, (b) CO2 conversion, (c) H2 yield, and (d) CO yield.
Two simultaneous routes for CH4 conversion.
Compared with thermal reforming, both CH4 conversion and H2 yield were clearly promoted in hybrid reforming (Figure 5), and the main pathway of CH4 conversion and H2 yield could be simply described as CH4 dehydrogenation (R3). It is proposed that CH4 dehydrogenation was enhanced by the synergistic effect of DBD and catalyst. Molecular beam study revealed that dissociative chemisorption of CH4 on the metal surface was enhanced by vibrational excitation [42]. The numerical simulation of one-dimensional streamer propagation demonstrated that the vibrationally excited CH4 is the most abundant and long-lived species generated by low-energy electron impact [43]. The reaction mechanism of plasma-enabled catalysis could be explained by the Langmuir-Hinshelwood (LH) reaction scheme. The analysis of overall activation energy is expected to understand the contribution of plasma-generated reactive species.
The CO2 conversion and CO yield were promoted in hybrid reforming compared to thermal reforming (Figure 5). H2O was simultaneously produced as a by-product by reverse water gas shift (RWGS) reaction (R4). Reactivity of plasma-activated H2O was confirmed by Arrhenius plot analysis where reaction order for H2O was doubled by DBD [44]. Plasma-activated H2O promotes reaction with adsorbed carbon; it creates additional pathways (R5) to syngas (H2 and CO). The CO2 conversion and CO yield were promoted in the hybrid reforming, illustrating that the reverse-Boudouard reaction (R2) was enhanced by DBD. The reaction between plasma-activated CO2 and adsorbed carbon increases CO yield. The same result was obtained in the de-coking period [10]. Although excessive production of carbon is detrimental for catalyst activity and lifetime, the presence of adsorbed carbon creates key pathways for emerging plasma-induced synergistic effect. Consequently, plasma-activated CO2 and H2O would promote surface reaction and increase CO and H2 yield. Figure 5 clearly shows that the slope of each line increased in hybrid reforming compared with thermal reforming, attributing to the nonthermal plasma-excited species. The increase of slope could be further explained by the promoted overall reaction order, which plays the key role in the estimation of the rate-determining step [44].
Synergism in plasma catalysis in the single-stage reactor is not fully understood due to the complex interaction between the various plasma-catalyst interaction processes [45, 46, 47, 48, 49]. Kim et al. [27] discussed the criteria for interaction between nonthermal plasma and the porous catalyst. The chemical species in nonthermal plasma are highly reactive; the lifetime is very short, e.g., O (1D), 10 ns; O (3P), 50 μs; and OH, 100 μs: their one-dimensional diffusion length is limited from 0.7 to 65 μm. Plasma generated species within diffusion length from the external surface of pellets would contribute to the plasma-induced reaction pathways. The interdependence of plasma and catalyst can be discussed as two aspects: catalyst affects plasma, and plasma affects catalyst.
With the packed catalyst in the plasma zone, gaseous species adsorbed on the catalyst surface increase the concentration of surface species. In addition, the electric field is enhanced near the catalyst surface due to catalyst nanofeatures [50, 51]. Moreover, the packed catalyst also enables the discharge type change, as well as microdischarge generation.
Without packed materials, discharge mode is the “free-standing” filamentary discharge propagating across the gas gap (Figure 7(a)). With a packed catalyst, the surface streamer is propagated with the close contact with the catalyst surface, and intensive partial discharges occur between the contact area of catalysts [52, 53]. The time-resolved visualization of surface streamer propagation and partial discharge were detected by Kim et al. [54] with an intensified charge-coupled device (ICCD) camera. Figure 7(b) shows time-resolved images of surface streamers (i.e., primary surface streamer and secondary surface streamer) propagating on the surface. Enhanced catalytic performance in the presence of a catalyst is closely linked with the propagation of surface streamers [55]. Moreover, with packed catalyst, microdischarge is generated inside catalyst pores (when the pore sizes >10 μm) [56, 57]. Zhang et al. [56] investigated microdischarge formation inside catalyst pores by a two-dimensional fluid model in the μm range (Figure 7(c)), indicating that the plasma species can be formed inside pores of structured catalysts in the μm range and affect the plasma catalytic process.
(a) Filamentary discharge without catalyst pellet, (b) time-resolved images of surface streamers propagating on the surface of γ-Al2O3 (reproduced with permission from ref 54. Copyright 2016 IOP Publishing), and (c) distributions of the electron density and total ion density with a 100 μm pore (reproduced with permission from ref 56. Copyright 2016 Elsevier).
The plasma also affects the catalyst properties, which are summarized as the following aspects:
Modification of physicochemical properties of the catalyst by plasma, which is widely used in catalyst preparation processes [58]. With plasma preparation, the catalyst obtains a higher adsorption capacity [59], higher surface area, and higher dispersion of the catalyst material [60, 61, 62], leading to a plasma-enhanced reactivity.
It is possible that plasma makes changes in the surface process with the catalyst. As for the CH4 reforming process, the deposited carbon from Ni catalysts can be removed effectively by plasma-excited CO2 and H2O [8]. The other example of the synergism is NH3 decomposition for the application of fuel cell, where NH3 conversion reached 99.9% when combining plasma and catalyst, although the conversion was less than 10% in the case of either plasma or catalyst only reaction [63].
Based on Arrhenius plot analysis, plasma can decrease the activation barriers (overall activation energy), attributed to the vibrational excitation, which is schematically depicted in Figure 8. The net activation barrier will be
The excited species or dissociated species might create other pathways with the presence of catalyst, e.g., during the CO2 plasma oxidation process, plasma-enhanced CO2 oxidized Ni/Al2O3 catalyst to form a NiO layer, which could drive an oxidation–reduction cycle in dry methane reforming reaction. The same NiO layer was found when specific energy input (SEI) was sufficiently high: the O2 that dissociated from CO2 plays the key role in the oxidation process. The details will be interpreted in Section 5.2.
Reduction of the overall activation energy by vibrational excitation of the reactants. (A) Adiabatic barrier crossing case and (B) nonadiabatic barrier crossing case. Reprinted with permission from ref 64. Copyright 2004 AAAS.
Coke formation behavior was studied as a reaction footprint to track reaction pathways induced by DBD [26]. Coke morphology and their distribution over the 3 mm spherical Ni/Al2O3 catalyst pellets were obtained after 60 min DMR. Figure 9 shows cross-sectional carbon distribution, where (a)–(c) and (d)–(f) correspond to plasma catalysis and thermal catalysis in low, middle, and high temperatures. For the thermal catalysis with the temperature at 465°C, carbon deposition over the entire cross-section was obvious. With the temperature increased, coke was decreased and finally became nondetectable at ca. 620°C. At low temperature, plasma catalysis suppressed the coke formation significantly over the entire cross-section.
Carbon distribution over the 3 mm spherical pellet cross-section after 60 min reforming: plasma catalysis (a)–(c) and thermal catalysis (d)–(f), respectively. Reprinted with permission from ref 26. Copyright 2018 IOP Publishing.
By the analysis of scanning electron micrographs (SEM) and Raman spectrum, fine carbon filaments were detected on the external pellet surface in plasma catalysis [26]. In contrast, thick fibrous carbon deposition was observed on the external surface in thermal catalysis, as well as in the internal pores in both thermal and plasma catalyses. The CH4 dehydrogenation on catalyst is enhanced by nonthermal plasma, contributing to the generation of highly filamentous and amorphous carbon. Such nonthermal plasma-enhanced reaction has been demonstrated by carbon nanotube growth [66] and plasma-enabled steam methane reforming [67]. The fine amorphous carbon filaments, deposited in the external surface of catalyst, prove that the interaction of DBD occurs mainly in the external surface. Consequently, DBD generation and plasma-excited species diffusion are inhibited in the internal pores of catalyst.
The nickel (Ni) of Ni/Al2O3 catalyst was oxidized slightly by CO2 in the thermal catalysis [68, 69] . However, the significant Ni oxidation by CO2(R6) was demonstrated when the catalyst were packed in nonthermal plasma zone. In this case, Ni uptakes surface oxygen beyond the adsorption/desorption equilibrium (i.e., Langmuir isotherm) to form NiO, which further promotes CH4 dehydrogenation without solid carbon deposition (R7):
The specific energy input (SEI) is a critical operational parameter in plasma-enabled CO2 treatment process due to the fact that dominant reaction pathway shifts dramatically with SEI:
SEI expresses energy consumption by discharging per unit volume of the feed gas, which could be further interpreted as average electrical energy (eV) per molecule. In Eq. (2), C is the conversion factor of the unit [10]. Two contrasting conditions are demonstrated in plasma-enabled CO2 oxidation: one is designated as the direct oxidation route; with a small SEI, CO2 dissociation to CO and 0.5 O2(R9) is negligible, and then the plasma-excited CO2 dominates the oxidation process (R8). The other is the indirect oxidation route where O2 provides an additional oxidation pathway; with a large SEI, CO2 is dissociated into CO and O2(R9) without heterogeneous catalysts by electron impact [70, 71], followed by Ni oxidation by O2(R10).
The plasma-enhanced direct oxidation route (R8) is further investigated because the plasma-enabled synergistic effect was demonstrated distinctly without O2 [8, 10, 26]. Ni oxidation behavior without O2 was studied with SEI = 0.46 eV/molecule. The CO2 conversion is far below 1% when the SEI was smaller than 0.5 eV/molecule [72, 73]; in the plasma and thermal oxidation, the CO2 flow rate, catalyst temperature, and the oxidation time were controlled as 1000 cm3/min, 600°C, and 70 min, respectively.
After DBD-enhanced oxidation and thermal oxidation, the formation of NiO and its distribution over the cross-section of 3 mm spherical pellet were investigated by Raman spectroscopy and optical microscope. Results showed that the NiO layer was recognized clearly with the thickness of ca. 20 μm. In contrast, the NiO layer was not identified after thermal oxidation. We should point out that the plasma-excited CO2 has a strong oxidation capability of Ni catalyst. In addition, the effect of DBD is inhibited in the internal pores beyond 20 μm from the pellet surface.
In the thermal oxidation, CO2 is most likely adsorbed at the perimeter between Ni nanocrystals and Al2O3 interfaces [74, 75, 76] (Figure 10(a)). Subsequently, the adsorbed CO2 oxidize Ni to NiO near the perimeter. It is clear that the reaction sites for thermal oxidation are limited in the perimeter. The Ni oxidation reaction terminates after the reaction sites are fully oxidized by adsorbed CO2. In plasma-enhanced oxidation reaction, CO2 is firstly excited by electron impact. The vibrationally excited CO2 plays the key role to enhance adsorption process and subsequent oxidation reaction of Ni catalyst, leading to an extensive Ni nanoparticle oxidation, which occurs not only in the perimeter but also in the terrace, step, and kink (Figure 10(b)). Figure 10(c) and (d) show hemispherical catalyst pellets after thermal and plasma oxidation. After thermal oxidation, the external surface and cross-section of catalyst pellets remained black. In contrast, after plasma oxidation, the external surface was oxidized and has showed whitish color change (oxidized stage); in the meantime, the cross-section of the hemispherical pellet has been kept black (unoxidized stage).
Ni oxidation pathways: (a) thermal oxidation including CO2 adsorption near the perimeter of Ni catalysts and (b) plasma-enhanced oxidation. Hemispherical catalyst pellets: (c) thermal oxidation and (d) plasma oxidation.
The vibrationally excited CO2 by DBD would induce Ni oxidation to form the oxygen-containing active species (i.e., NiO) rather than simple adsorption, leading to oxygen-rich surface beyond Langmuir isotherm. Incoming plasma-excited CO2 would carry a few eV internal energy due to the gas phase vibration-to-vibration energy transfer [77, 78], which is the main source of energy for NiO formation. Plasma-excited CO2 could promote the adsorption flux; however, the adsorbed CO2 is finally desorbed by the equilibrium limitation unless it forms NiO. In addition, the plasma-induced nonthermal heating mechanism plays another key role in the enhancement of Ni oxidation. Charge recombination and association of radicals can release energy corresponding to 1–10 eV/molecule on catalyst surface. When this excess energy is directly transferred to the adsorbed CO2, Ni oxidation may be enhanced without increasing macroscopic catalyst temperature. This reaction scheme is explained by nonthermal plasma-mediated Eley-Rideal mechanism, rather than precursor-type adsorption enhancement.
In the DMR process, the oxygen-rich surface (NiO layer) has a capability of oxidizing a large flux of ground-state CH4 efficiently. Consequently, CH4 is not necessarily preexcited. CH4 is almost fully reacted in the NiO layer (20 μm thickness) to inhibit the coke deposition toward the internal pores [26]. However, in the thermal catalysis, NiO is generated in a negligible amount. The ground-state CH4 can diffuse into internal pores and deposit coke as previously confirmed [26]. Formation of NiO shell (Figure 10(d)) and the coke formation behavior (Figure 9) are well correlated in plasma catalysis as further discussed in the next section.
Although the synergies of plasma and catalyst have been summarized in Section 4, the interaction between DBD and catalyst pores will be further discussed in this section based on the carbon formation and oxidation behavior, as well as DBD-enhanced DMR. For the plasma catalysis, carbon deposition in the internal pores could be remarkably prevented, and fine amorphous carbon filaments were deposited only on the external surface of pellets. A similar trend was observed when NiO was formed in the limited region over the external surface (20 μm depth) only when DBD was superimposed. The results of coke formation behavior and oxidation behavior of Ni-based catalyst in plasma catalysis evidence that the interaction of DBD and catalyst occurs at the external surface of the pellets and the effected thickness is ca. 20 μm. Neither generation of DBD nor diffusion of plasma-generated reactive species in the internal pores is possible. Although DBD and pellet interaction is limited in the external surface, conversion of CH4 and CO2 was promoted clearly compared with thermal catalysis: this is the clear evidence of reaction enhancement by DBD.
For DBD, due to the enhanced physical interaction between propagating streamers and catalysts, plasma and catalyst contact area, as well as the streamer propagation from one pellet to the other, are promoted significantly. Nevertheless, electron density in a narrow filamentary channel is of the order of 1014 cm−3 [6, 79, 80]; in contrast, molecule density at standard condition is approximately 1019 cm−3, indicating that a major part of the gas stream is neither ionized nor excited. Consequently, the extremely low proportion of ionized and excited species is inadequate to explain the net increase of CH4 and CO2 conversion and selectivity change by DBD. However, if reactive species are fixed and accumulated on the surface of the catalyst, the gross conversion of materials will be promoted. For this reason, the hetero-phase interface between DBD and the external pellet surface provides the most important reaction sites. In Section 5.2, nonthermal plasma oxidation of Ni to NiO creates a critically important step for plasma-enabled synergistic effect.
As Section 4.1 mentioned, gas breakdown is hard to occur in a pore smaller than 10 μm. For the pores catalyst with a pore size less than 2 nm, standard Paschen-type gas breakdown is impossible. To sum up, the external surface of pellet plays the key role for the DBD and catalyst interaction; however, the internal pores play a minor role.
The synergistic effect induced by DBD was clearly observed both in the CH4 and CO2 conversion and in the syngas yield. CH4 dehydrogenation was enhanced by the synergistic effect of DBD and catalyst. Plasma-activated CO2 and H2O would promote surface reaction and increase CO and H2 yield. The analysis of overall activation energy is expected to understand the contribution of plasma-generated reactive species.
In plasma catalysis, the fine amorphous carbon filaments, deposited in the external surface of catalyst, prove that the interaction of DBD occurs mainly in the external surface. The DBD generation and plasma-excited species diffusion are inhibited in the internal pores of the catalyst. Moreover, although the interaction between plasma and catalyst is limited in the external surface, the coke deposition was inhibited significantly in the internal pores by DBD, which is the clear evidence of reaction enhancement by DBD.
Oxidation behavior of Ni-based catalyst in nonthermal plasma-enabled catalysis showed that the NiO layer was generated in the external surface with the thickness of ca. 20 μm during plasma oxidation. In the internal pores, Ni oxidation is inhibited due to the negligible interaction with DBD. Contributing to the NiO layer, the surface of catalyst uptakes more oxygen beyond thermal equilibrium, which is known as Langmuir isotherm, creating a new reaction pathway via NiO. In the plasma catalysis of DMR, NiO drives the oxidation-reduction cycle, which promotes CH4 dehydrogenation on the surface. Consequently, carbon deposition is suppressed effectively.
For further improvement of plasma-enhanced DMR, the following issues should be investigated:
The effect of radical injection on reaction enhancement should be kinetically analyzed by the Arrhenius plot method, and the analysis of the overall activation energy is expected to understand the contribution of plasma-generated reactive species.
Exploring new types of catalysts, dedicated to plasma catalysis, is an important subject of research. We have demonstrated that the interaction of DBD and catalyst occurs only at the external surface of the pellets, and the effected thickness is ca. 20 μm, which means a majority of the active sites in pores of catalyst do not interact with any excited species. New catalyst preparation method such as catalytic functionalization of reactor wall and catalyst coating for the reactor may be beneficial to strengthen the synergistic effect of nonthermal plasma and catalytically functionalized surface.
The catalyst activity of partially oxidized catalyst and the nonthermal plasma heating mechanism have not been demonstrated experimentally yet; moreover, diagnosis of intermediate species on the surface, created by plasma-derived species, as well as their reaction dynamics are expected to be investigated for deep insight in plasma catalysis.
Although the plasma-induced energy transfer mechanism is commonly accepted in particle growth, it has yet to be investigated within the scope of plasma catalysis. Deep understanding of highly transient and nonequilibrium energy transfer via excited molecules, without macroscopic temperature change, need to be studied.
The individual contribution of radical injection and heat generation, as well as combination of those, must be understood. The gap between macroscopic and microscopic understanding, including various time scales covering nanoseconds to the millisecond, should be bridged by consistent manner.
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I am also a member of the team in charge for the supervision of Ph.D. students in the fields of development of silicon based planar waveguide sensor devices, study of inelastic electron tunnelling in planar tunnelling nanostructures for sensing applications and development of organotellurium(IV) compounds for semiconductor applications. I am a specialist in data analysis techniques and nanosurface structure. I have served as the editor for many books, been a member of the editorial board in science journals, have published many papers and hold many patents.",institutionString:null,institution:{name:"Sheffield Hallam University",country:{name:"United Kingdom"}}},{id:"54525",title:"Prof.",name:"Abdul Latif",middleName:null,surname:"Ahmad",slug:"abdul-latif-ahmad",fullName:"Abdul Latif Ahmad",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:null},{id:"20567",title:"Prof.",name:"Ado",middleName:null,surname:"Jorio",slug:"ado-jorio",fullName:"Ado Jorio",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Universidade Federal de Minas Gerais",country:{name:"Brazil"}}},{id:"47940",title:"Dr.",name:"Alberto",middleName:null,surname:"Mantovani",slug:"alberto-mantovani",fullName:"Alberto Mantovani",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:null},{id:"12392",title:"Mr.",name:"Alex",middleName:null,surname:"Lazinica",slug:"alex-lazinica",fullName:"Alex Lazinica",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/12392/images/7282_n.png",biography:"Alex Lazinica is the founder and CEO of IntechOpen. After obtaining a Master's degree in Mechanical Engineering, he continued his PhD studies in Robotics at the Vienna University of Technology. Here he worked as a robotic researcher with the university's Intelligent Manufacturing Systems Group as well as a guest researcher at various European universities, including the Swiss Federal Institute of Technology Lausanne (EPFL). During this time he published more than 20 scientific papers, gave presentations, served as a reviewer for major robotic journals and conferences and most importantly he co-founded and built the International Journal of Advanced Robotic Systems- world's first Open Access journal in the field of robotics. Starting this journal was a pivotal point in his career, since it was a pathway to founding IntechOpen - Open Access publisher focused on addressing academic researchers needs. Alex is a personification of IntechOpen key values being trusted, open and entrepreneurial. Today his focus is on defining the growth and development strategy for the company.",institutionString:null,institution:{name:"TU Wien",country:{name:"Austria"}}},{id:"19816",title:"Prof.",name:"Alexander",middleName:null,surname:"Kokorin",slug:"alexander-kokorin",fullName:"Alexander Kokorin",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/19816/images/1607_n.jpg",biography:"Alexander I. Kokorin: born: 1947, Moscow; DSc., PhD; Principal Research Fellow (Research Professor) of Department of Kinetics and Catalysis, N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow.\r\nArea of research interests: physical chemistry of complex-organized molecular and nanosized systems, including polymer-metal complexes; the surface of doped oxide semiconductors. He is an expert in structural, absorptive, catalytic and photocatalytic properties, in structural organization and dynamic features of ionic liquids, in magnetic interactions between paramagnetic centers. The author or co-author of 3 books, over 200 articles and reviews in scientific journals and books. He is an actual member of the International EPR/ESR Society, European Society on Quantum Solar Energy Conversion, Moscow House of Scientists, of the Board of Moscow Physical Society.",institutionString:null,institution:{name:"Semenov Institute of Chemical Physics",country:{name:"Russia"}}},{id:"62389",title:"PhD.",name:"Ali Demir",middleName:null,surname:"Sezer",slug:"ali-demir-sezer",fullName:"Ali Demir Sezer",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/62389/images/3413_n.jpg",biography:"Dr. Ali Demir Sezer has a Ph.D. from Pharmaceutical Biotechnology at the Faculty of Pharmacy, University of Marmara (Turkey). He is the member of many Pharmaceutical Associations and acts as a reviewer of scientific journals and European projects under different research areas such as: drug delivery systems, nanotechnology and pharmaceutical biotechnology. Dr. Sezer is the author of many scientific publications in peer-reviewed journals and poster communications. Focus of his research activity is drug delivery, physico-chemical characterization and biological evaluation of biopolymers micro and nanoparticles as modified drug delivery system, and colloidal drug carriers (liposomes, nanoparticles etc.).",institutionString:null,institution:{name:"Marmara University",country:{name:"Turkey"}}},{id:"61051",title:"Prof.",name:"Andrea",middleName:null,surname:"Natale",slug:"andrea-natale",fullName:"Andrea Natale",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:null},{id:"100762",title:"Prof.",name:"Andrea",middleName:null,surname:"Natale",slug:"andrea-natale",fullName:"Andrea Natale",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"St David's Medical Center",country:{name:"United States of America"}}},{id:"107416",title:"Dr.",name:"Andrea",middleName:null,surname:"Natale",slug:"andrea-natale",fullName:"Andrea Natale",position:null,profilePictureURL:"//cdnintech.com/web/frontend/www/assets/author.svg",biography:null,institutionString:null,institution:{name:"Texas Cardiac Arrhythmia",country:{name:"United States of America"}}},{id:"64434",title:"Dr.",name:"Angkoon",middleName:null,surname:"Phinyomark",slug:"angkoon-phinyomark",fullName:"Angkoon Phinyomark",position:null,profilePictureURL:"https://mts.intechopen.com/storage/users/64434/images/2619_n.jpg",biography:"My name is Angkoon Phinyomark. I received a B.Eng. degree in Computer Engineering with First Class Honors in 2008 from Prince of Songkla University, Songkhla, Thailand, where I received a Ph.D. degree in Electrical Engineering. My research interests are primarily in the area of biomedical signal processing and classification notably EMG (electromyography signal), EOG (electrooculography signal), and EEG (electroencephalography signal), image analysis notably breast cancer analysis and optical coherence tomography, and rehabilitation engineering. I became a student member of IEEE in 2008. During October 2011-March 2012, I had worked at School of Computer Science and Electronic Engineering, University of Essex, Colchester, Essex, United Kingdom. In addition, during a B.Eng. I had been a visiting research student at Faculty of Computer Science, University of Murcia, Murcia, Spain for three months.\n\nI have published over 40 papers during 5 years in refereed journals, books, and conference proceedings in the areas of electro-physiological signals processing and classification, notably EMG and EOG signals, fractal analysis, wavelet analysis, texture analysis, feature extraction and machine learning algorithms, and assistive and rehabilitative devices. I have several computer programming language certificates, i.e. Sun Certified Programmer for the Java 2 Platform 1.4 (SCJP), Microsoft Certified Professional Developer, Web Developer (MCPD), Microsoft Certified Technology Specialist, .NET Framework 2.0 Web (MCTS). 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