| abstract |
Catalyst for producing unsaturated aldehyde and unsaturated carboxylic acid by vapor phase catalytic oxidation of at least one compound selected from the group consisting of propylene, isobutylene, t-butanol and methyl-t-butyl ether, and unsaturated using the catalyst Provided are methods for preparing aldehydes and unsaturated carboxylic acids. The catalyst of the present invention is (A) unsaturated aldehydes and unsaturated carboxyl by vapor phase catalytic oxidation of propylene, isobutylene, t-butanol and / or methyl-t-butylether, which is an essential component of Mo, Bi and Fe. A catalyst for preparing an acid, and (B) a solid acid having a strong acidity (Ho) of -11.93 or less, and the catalyst of the present invention has excellent catalytic activity and lifespan, so that a high yield and stable unsaturated aldehyde and unsaturated carboxyl for a long time Acids can be prepared. |