| 摘要 |
A coated catalyst comprising (a) an inert carrier having a particle diameter of not less than 100 mu m and a surface area of up to 20 m2/g and (b) a coating which firmly adheres to the outer surface and in the edge zone, near the surface, of the carrier particles, and which contains the catalytic material, can be prepared by applying the catalytic material in the form of a powder of particle size not more than 300 mu m, in the presence of water, to the vigorously agitated carrier by a process wherein catalytically active material in an amount of from 1 to 40 g/minute/liter of carrier, and water in a weight ratio of catalytic material to water of from 1:1 to 30:1, are applied continuously and spatially separate from one another, each at a constant speed, onto the carrier particles, which may or may not have been pre-moistened with water in an amount of up to 95% of the particle absorbency, in such a way that the water content of the coating which forms is less than the maximum degree of saturation of the coating of catalytic material.
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