The work presents the studies on the epoxidation of allyl-glycidyl ether (AGE) to diglycidyl ether (DGE) over the mesoporous Ti-SBA-15 catalyst and with 60 wt% hydrogen peroxide. The influence of the following parameters was studied: the temperature 0–100°C, the molar ratio of AGE/H2O2 = 0.03:1 – 4:1, the content of Ti-SBA-15 catalyst 0.0–0.5 wt%, and the reaction time 15–240 min. The studies showed that it is possible to obtain DGE with the selectivity of 100 mol% (for reaction time below 60 min) but at low conversion of AGE – about 4 mol%. The prolongation of the reaction time decreases the selectivity of DGE because the following competitive reactions take place: (1) hydration of the epoxide ring in AGE and 3A12PD formation, (2) collapsing of the ethers by hydrolysis of the ether groups, and (3) the epoxidation and the hydration of the products of collapsing and obtaining glycerol. The explanation of the very high ineffective decomposition of hydrogen peroxide and possible ways of increasing its efficiency of conversion are also presented.
Part of the book: Advanced Catalytic Materials