The effects of TiO2 phase and SiO2 supports on methyl oleate epoxidation

Abstract

This work studies about the epoxidation reaction of methyl oleate with TiO2 or TiO2/SiO2 catalysts and hydrogen peroxide. Study of TiO2 catalysts interests in catalysts from commercial and sol gel method. The highest catalytic activity and selectivity of TiO2 from commercial is TiO2 commercial type B which gives 46.10% and 79.75%, respectively. For sol gel method, the highest catalytic activity at 75.82% and selectivity at 90.85% is TiO2 calcination temperature at 300OC, due to low crystallinity and high surface area. TiO2/SiO2 with different type of SiO2 support (MCM-41, SBA-15, silicalite, silica gel and fumed silica) shows different catalytic activity and selectivity. The highest catalytic activity is TiO2/Silicalite with 44.41% conversin. The highest selectivity is TiO2/SBA-15 with 58.90% selectivity. TiO2/SiO2 by different synthesis method (wet impregnation, grafting and incipient wetness impregnation) show the same catalytic activity around 35%. However, wet impregnation method gave higher selectivity at 28.43% than other synthesis method. TiO2/SiO2 with different Ti loading show that the more Ti loading give more catalytic activity but less selectivity of epoxidation reaction. Which increase Ti from 1.5% to 15% catalytic activity increase from 18.86% to 97.49% and selectivity decrease from 42.44% to 0.00% selectivity.