RECOVERY OF CATALYTICALLY ACTIVE COMPONENT AND CARRIER FROM WASTE CATALYST

摘要

PURPOSE:To recover a catalytically active substance and carrier in the form of chloride, effectively from a waste catalyst comprising a catalytically active material deposited on a porous hydrocarbon carrier by treating the waste catalyst by chlorination. CONSTITUTION:Waste catalyst comprising a carrier consisting of porous hydrocarbon produced from SiC powder derived from an Si-accumulating biomass such a rice hulls and/or rice straw, etc., contg. a catalytically active substance such as Pt, Rh, etc., deposited thereon, is chlorinated by exposing the waste catalyst to gaseous chlorine at 600-1000 deg.C in the presence of a K salt such as KCl, etc. Thus, porous SiC is transformed to CCl4 and recovered in the form of gas. On one hand, the catalytically active substance is also chlorinated and recovered by dissolving it in water or dil. HCl. By this method, the catalytically active substance and the carrier are recovered at high efficiency and the materials are reutilized.