Preparation of coated catalysts

In a process for the preparation of a coated catalyst consisting essentially of

• (a) an inert carrier having particles of not less than 100 .mu.m diameter and a surface area of up to 20 m.sup.2 /g and
• (b) a coating consisting essentially of the catalytic material which adheres firmly to the outer surface and to the edge zone, near the surface, of the carrier particles by applying the catalytic material as a 10-70% strength suspension in water to the agitated carrier particles, which are at below 70.degree. C., the improvement that the suspension is sprayed, at a constant rate of from 0.01 to 2.0 kg of active material/hour/liter of carrier onto the carrier particles, while at the same time uniformly passing from 0.1 to 12 m.sup.3 (S.T.P.)/hour/liter of carrier of an inert gas at from 20.degree. to 300.degree. C. over the carrier particles, under conditions such that the water only evaporates incompletely and the water content of the resulting coating is 30 to 95% of the maximum degree of saturation of the catalytic material.