The said catalyst consists of PVA modified layered clay as active component 20-90 wt%, auxiliary component selected from RE containing high silicon zeolite, ZSM-5, beta-zeolite and Y-type zeolite 0-40 wt%, carrier component selected from kaolin and other material 0-50 wt% and PVA modified alumina or other inorganic oxide as adhesive 10-40 wt%. The preparation process is that in the presence of PVA, above said components are pulped, spray dried, ammonia-adding aged, dried and roasted. With high activity, stability and olefine selectivity, the said catalyst is suitable for cracking heavy oil to produce olefine and gasoline. |