Alloy catalyst for co-production of dimethyl oxalate and dimethyl carbonate and preparation method thereof

The embodiment of the invention provides a dimethyl oxalate and dimethyl carbonate co-production alloy catalyst and a preparation method thereof. The catalyst comprises a carrier formed by mixing gamma-Al2O3 and a molecular sieve, an active component and an auxiliary agent, wherein on the basis of the carrier, the active component is a Pd source, and the mass fraction of the Pd source is 0.05-0.2%; the auxiliary agent is rare earth metal with the mass fraction of 0.5%-1%; pd in the catalyst is a monatomic atom and is dispersed in rare earth metal, and Pd and the rare earth metal form an alloy. According to the alloy monatomic catalyst, the active component Pd is uniformly distributed and low in content, so that the alloy monatomic catalyst is suitable for a reaction of synthesizing dimethyl oxalate and dimethyl carbonate from gas-phase carbon monoxide and methyl nitrite; the catalyst has the advantages of high raw material conversion rate, good target product selectivity, greatly flexible and adjustable selec