Method of preparing alumina based catalyst or adsorbent using boehmite or pseudobomite powder

摘要

The present invention relates to a method for preparing an alumina polycrystal-based catalyst or adsorbent in which grain boundaries are formed from bomite or pseudobomite powders, comprising: bomite or pseudobomite powder; and a first step of preparing an acid solution whose mixing amount is adjusted so that sol is not formed by peptizing when mixed therewith; The slurry of the first step of mixing the bomite or pseudobomite powder and the acid solution is kneaded without sol formation, the surface of the bomite or pseudobomite powder particles are etched by acid, and the surface-etched powder particles are agglomerated and combined. second step; a third step of molding the paste formed in the second step; A fourth step of drying and calcining the molding of the third step to form an Al ₂ O ₃ polycrystal in which the boundary between the bomite or pseudobomite powder particles is adjacent to form a grain boundary; and optionally, a fifth step of supporting a metal component on _{the Al 2} O _{3 polycrystal of the fourth step.} The present invention can solve the problem of powders falling off from the molded body itself or the molded body when used at a high temperature when an alumina molded body is manufactured through drying and firing after molding using a slurry of bomite powders instead of a bomite sol.