CATALYST AND PROCESS FOR PRODUCING THE SAME

摘要

A catalyst in a granular form is provided which has crystalline surface parts having an increased effective area and has been improved in the crushing strength of the granules without the need of using a binder. A slurry containing a catalyst powder obtained by pulverizing a metallosilicate-containing raw material with a bead mill is dried by the spray drying method to obtain granules of the catalyst. The raw material may include a metallosilicate having pores substantially having a diameter of 4.5-6.5 angstroms. The raw material is preferably pulverized so that the metallosilicate comes to have a particle diameter of 1.0 µm or smaller in terms of 50%-cumulative frequency. The metallosilicate preferably has, deposited thereon, a metallic ingredient which comprises at least one member selected from rhenium, vanadium, molybdenum, tungsten, chromium, and compounds of these. The slurry is subjected to the drying step preferably after being aged. It is preferred to add polyvinyl alcohol to the slurry.