▎ 摘　　要

NOVELTY - Preparing coated bimetallic supported catalyst comprises providing bimetal supported catalyst precursor, and depositing coating layer oxide on surface of bimetallic supported catalyst precursor by chemical vapor deposition method or atomic layer deposition method, where catalyst comprises carrier, active metal component, auxiliary metal component and coating layer oxide. The carrier comprises silicon dioxide, aluminum oxide, titanium dioxide, magnesium oxide, cerium oxide, zirconium dioxide, activated carbon, carbon black, graphene and/or carbon nanotubes. The active metal component comprises metal palladium. The auxiliary metal component comprises gold, silver and/or copper. The coating layer oxide comprises gallium oxide and it is wrapped in a discontinuous manner on the surface of the bimetal supported catalyst precursor of the active metal component and the auxiliary metal component supported on the carrier. USE - The method is useful for preparing a coated bimetallic supported catalyst, which is useful for selective hydrogenation of acetylene or 1,3-butadiene in a mono-olefin-rich atmosphere (claimed). ADVANTAGE - The catalyst: has excellent catalytic performance; achieves the complete conversion of acetylene or 1,3 butadiene at a relatively mild temperature; maintains high selectivity of ethylene or butylene (above 95%), when the conversion rate reaches 100%; and suppresses the carbon deposition, so that the highly selective hydrogenation catalyst can remain stable for a long time. DETAILED DESCRIPTION - Preparing coated bimetallic supported catalyst comprises providing bimetal supported catalyst precursor, where content of active metal component metal palladium in terms of palladium element is 0.1-5 wt.%, and the content of the auxiliary metal component in terms of metal element is 0.1-10 wt.% based on the total weight of the bimetallic supported catalyst precursor, and depositing the coating layer oxide on the surface of the bimetallic supported catalyst precursor by a chemical vapor deposition method or an atomic layer deposition method, where the content of gallium oxide in the coating layer calculated as gallium element is 0.9-2.5 wt.%. The catalyst comprises carrier, active metal component, auxiliary metal component and coating layer oxide. The carrier comprises silicon dioxide, aluminum oxide, titanium dioxide, magnesium oxide, cerium oxide, zirconium dioxide, activated carbon, carbon black, graphene and/or carbon nanotubes. The active metal component comprises metal palladium. The auxiliary metal component comprises gold, silver and/or copper. The coating layer oxide comprises gallium oxide and it is wrapped in discontinuous manner on the surface of the bimetal supported catalyst precursor of the active metal component and the auxiliary metal component supported on the carrier. INDEPENDENT CLAIMS are also included for: a coated bimetallic supported catalyst obtained by above mentioned method; and use of coated bimetallic supported catalyst in the selective hydrogenation of acetylene or 1,3-butadiene in a mono-olefin-rich atmosphere, comprising pre-treating the coated bimetal supported catalyst before using, where the pretreatment is carried out by oxidizing with an oxygen-containing atmosphere at 180-300degrees Celsius for 0.1-2 hours, and reducing with a hydrogen-containing atmosphere at 100-200degrees Celsius for 0.1-2 hours.