首页|Enhancing oxidative hydration of ethylene towards ethylene glycol over metal-modified titanosilicate catalysts
Enhancing oxidative hydration of ethylene towards ethylene glycol over metal-modified titanosilicate catalysts
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Metal-dopant modification is a promising approach to enhance the catalytic performance of titanium silicate molecular sieve.Herein,titanium silicalite-1(TS-1)with different titanium contents and a series of metal-doping modified TS-1 are prepared,to enhance the synthesis of ethylene glycol(EG)through oxidative hydration of ethylene.The EG selectivity show a volcano relationship along with the increase of Ni addition,and reach maximum in 80.63 % at 0.13 wt % Ni loading.The Ni promoter mechanism is revealed that NiO species enhances the electropositivity of skeleton Ti and neutralizes the surface acidity of TS-1,which improves the efficient utilization of H2O2 and selectivity of EG.Furthermore,Ni-modified TS-1 shows superior stability to TS-1,as well as satisfactory reusability since the deactivation of catalyst is reversible through high-temperature calcination.This work demonstrates the feasibility and mechanism of Ni promoter and provides a promising strategy for the development of TS-1 catalysts.
Oxidative hydration of ethyleneMetal-doping modificationTitanium silicalite-1Ethylene glycolPromoter mechanism
Feipeng Cheng、Jihao Cheng、Yang Nan
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State Key Laboratory of Organic-Inorganic Composites,Beijing Key Laboratory of Energy Environmental Catalysis,Beijing University of Chemical Technology,Beijing 100029,China
Lanzhou Petrochemical Research Center of PetroChina,Petrochemical Research Institute,Lanzhou 730060,Gansu,China
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