Cerium(IV) oxide (CeO)-based materials are effective catalysts for the synthesis of dimethyl carbonate (DMC) from carbon dioxide (CO) and methanol (CHOH). Herein, 5% Y-CeO was synthesized by the co-precipitation method. It forms a solid solution structure, which leads to the highest concentration of oxygen vacancies. The Y-V-Ce active site created by Y doping enhances the adsorption and activation of CO based on moderately passivating CHOH adsorption. Consequently, 5% Y-CeO exhibited the highest CHOH conversion rate of 0.8% and a DMC yield of 15 mmol⋅(g cat), which is 1.4 times of pure CeO (reacting in a stainless-steel autoclave at 140 °C with a stirring speed of 1000 r⋅min and an initial pressure of 3.0 MPa for 2 h). An adsorption test and in situ diffuse reflectance infrared Fourier transform spectroscopy showed that 5% Y-CeO could effectively inhibit the formation of triple-bonded methoxy species, and promote the formation of bidentate carbonate and bridged methoxy intermediates, which is conducive to the improvement of reaction activity.
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