Cesium containing multimetal oxide catalyst compositions for the preparation of methacrolein by gas-phase-catalytic oxidation

摘要

Cesium based multimetal oxide compositions which are suitable as catalysts for the gas-phase-catalytic oxidative preparation of methacrolein from isobutene or tert-butanol or its methyl ether. The catalysts are characterized by increased selectivity for the formation of methacrolein. The catalysts have locally delimited regions of an oxide composition, preferably (Bi.sub.2 W.sub.2 O.sub.9), surrounded by the remaining constituents of the multimetal oxide.