Mo-promoted Pd/NaY catalyst for indirect oxidative carbonylation of methanol to dimethyl carbonate
A chlorine-free catalyst consisting of zeolite Y modified with Pd(Pd/NaY)catalyst has been pre-pared and used in the indirect oxidative carbonylation of methanol to dimethyl carbonate(DMC).The activity and stability of the catalyst were further improved by introducing molybdenum into Pd/NaY using a top-down approach(Pd-Mo/NaY catalyst).The Pd-Mo/NaY catalyst exhibited high-er stability compared to the Pd/NaY.A high CO conversion of 97％and DMC selectivity of 80％dur-ing a 30-hour catalytic test for the Pd-Mo/NaY were obtained.Furthermore,the incorporation of Mo was found to partially heal the silanols and hinder the aggregation of Pd in the Pd-Mo/NaY catalyst.The interactions between Mo and Pd increased the amount of active Pd2+species and enhanced the adsorption of CO reactant on the Pd-Mo/NaY catalyst.The key reaction intermediate of COOCH3*was captured by in situ diffuse reflectance infrared Fourier transform spectroscopy.The stabiliza-tion of active Pd2+species contributed to the enhanced catalytic activity of the Pd-Mo/NaY catalyst in the indirect oxidative carbonylation of methanol to DMC reaction.
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