Process for preparing coated catalysts based molybdates and iron bismuth doped by phosphorus and potassium.

摘要

The present invention concerns a catalyst preparation BASED COATED Bismuth molybdates and iron, phosphorus and potassium excited PROCESS. The process involves the preparation of catalysts COATED TYPE molybdates Bismuth AND IRON, excited by phosphorus and potassium, comprising preparing a composition INTERMEDIATE catalytically active, calcining FOLLOWED grinding, coating particles of a solid, inert support the outer surface is roughened BY SUCH COMPOSITION CRUSHED OR A MIXTURE THAT CONTAINS followed by calcining the particles thus coated and characterized in that: A) the intermediate composition catalytically active exempt POTASSIUM AND pHOSPHORUS, AND THAT B) THE INTRODUCTION OF POTASSIUM AND pHOSPHORUS performed during the coating step.