Xiujuan Deng

Fluorine-planted titanosilicate with enhanced catalytic activity in alkene epoxidation with hydrogen peroxide

Fluorine species were successfully implanted into a MWW-type titanosilicate via post-treatment, which generates the SiO3/2F units in the zeolite framework. The incorporated fluorine species significantly improved the catalytic performance in the epoxidation of alkenes as a result of enhancing the Lewis acid strength and the hydrophobicity of the zeolite.

Reaction Dynamics Behavior of Epoxidation of Allyl Chloride with Hydrogen Peroxide Catalyzed by Ti-MWW: Reaction Dynamics Behavior of Epoxidation of Allyl Chloride with Hydrogen Peroxide Catalyzed by Ti-MWW

The reaction mechanism for epoxidation of allyl chloride(ALC) with H2O2 catalyzed by Ti-MWW was studied in detail. The results showed that the epoxidation of ALC is first order reaction with respect to the catalyst amount and is the reactions between zero and first order with respect to the substrate concentration and the oxidant concentration. For H2O2,the epoxidation is first order reaction when its concentration is lower than 0.67 mol/L and zero order when its concentration is higher than 2 mol/L. For ALC,only when its concentration is very high,the obvious decrease of the reaction order from 1 to 0 was observed. And the epoxidation reaction rate is an S-type curve when the Ti content in Ti-MWW increases.