Effect of preparation conditions of titanium-containing zeolite on its catalytic activity in olefin epoxidation by hydrogen peroxide

Abstract

Presents the systematic study results of formation conditions of titanium-containing zeolite and its catalytic activity in the liquid-phase epoxidation of olefins by aqueous hydrogen peroxide in methanol. The yield of olefin oxide is used as a criterion of the catalyst activity. Samples obtained at the initial molar ratio tetrabutoxytitanium (TBOT) : tetraethoxysilane (TEOS) = 0,04÷0,06, molar ratio of tetrapropylammonium hydroxide: tetraethoxysilane = 0,25÷0,5, 40–60-h hydrothermal treatment of 170 °C are most catalytically active. Titanium-containing zeolite is washed either demineralized water or methyl alcohol. Calcining is carried out at 550 °C. The catalyst was synthesized in optimum conditions, allows to obtain yield of olefins oxides 90–95 % in the quantitative conversion of hydrogen peroxide.