Abstract
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.
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