Catalyst useful for producing alpha, beta-unsaturated carboxylic acid by gas phase oxidation of alpha, beta-unsaturated aldehyde, comprises support molded body with active material applied on support molded body

摘要

Catalyst comprises a support molded body with an active material, which is applied on the support molded body. The active material covering (q) is not 0.3mg/mm 2. The active material covering (q) is represented by an equation comprising (q) is equal to (Q/((100-Q)S m)) and Q is the active material of the catalyst in wt.%, and S m is the specific geometric surface area of the support molded body in mm 2/mg. Independent claims are also included for: (1) preparing the catalyst, comprising coating the support molded body with the active material by mixing many support molded bodies, powdery active material and a liquid binder in a container without saturating the powdered active mass with the liquid binder, where the duration of the coating process is less than 30 minutes; and (2) producing alpha , beta -unsaturated carboxylic acid comprising carrying out gas phase oxidation of alpha , beta -unsaturated aldehyde with molecular oxygen over a fixed catalyst filling, where the fixed catalyst filling comprises a filling of the catalyst.