▎ 摘　　要

NOVELTY - A catalyst comprises a support and a metal oxide dispersed on a surface of the support. USE - Catalyst is used in gas-phase plug flow reactor for carbonylation of alcohol e.g. 1-20C alcohol, 1-10C alcohol, or 1-5C alcohol, and ester e.g. methyl acetate, methyl propionate, and/or methyl butyrate (all claimed). ADVANTAGE - The catalyst has improved selectivity and stability, and comprises support which is typically chemically inert and has high surface area. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) gas-phase plug flow reactor, which has a reaction chamber, a catalyst bed provided inside the reaction chamber and the catalyst packed inside, a gas inlet, and a gas outlet. The gas inlet and gas outlet are in fluid communication with the reaction chamber; (2) carbonylation of alcohol, which involves exposing a mixture of one or more alcohols and carbon monoxide in a gas phase to the catalyst; and (3) carbonylation of ester, which involves exposing a mixture of one or more esters and carbon monoxide in a gas phase to the catalyst.