Carbonylation catalyst for high-selectivity synthesis of dimethyl carbonate, preparation and application thereof

The invention relates to a carbonylation catalyst for high-selectivity synthesis of dimethyl carbonate, preparation and application thereof, wherein the carbonylation catalyst comprises an oxide or composite oxide carrier, Pd and an auxiliary agent, and the Pd and the auxiliary agent are loaded on the carrier. The preparation method comprises the following steps: 1) mixing an auxiliary agent precursor and a palladium precursor to prepare an impregnation liquid; 2) dipping, stirring or spraying the carrier, and drying to obtain a catalyst precursor; and 3) roasting the catalyst precursor to obtain the carbonylation catalyst. According to the invention, the carbonylation catalyst is used for catalyzing the reaction of CO and methyl nitrite for gas-phase synthesis of dimethyl carbonate; compared with the prior art, the catalyst of the invention is efficient, stable, low in precious metal loading capacity and free of halogen, and avoids corrosion to equipment; and the catalyst provided bythe invention can be dire