FLUIDIZED BED VINYL ACETATE CATALYST

摘要

PROBLEM TO BE SOLVED: To provide a VAM catalyst, in particular a fluidized bed catalyst having higher resistance to wear and tear as well as more advantageous activity/selectivity characteristics. SOLUTION: A catalytically active material useful in the production of a vinyl acetate monomer from ethylene, acetic acid and an oxygen-containing gas under fluidized bed conditions comprises a porous fine spherical support containing catalytically active palladium microcrystals finely dispersed in the support. The catalytic material does not require the incorporation of gold so as to maintain activity and selectively. A selective metallic material is dispersed in a support having an affinity for palladium and exceedingly fine palladium microcrystals are formed to produce the objective vinyl acetate fluidized bed catalyst containing catalytically active palladium microcrystals finely dispersed in the support. The metallic material may be dispersed in a performed fine spherical support by impregnation or may tightly be incorporated into the support before impregnation with a soluble palladium material.