Catalytic cracking of C_(12)C_(32) hydrocarbons by hierarchical β- and Y-zeolite- containing mesoporous silica and silica-alumina using Curie point pyrolyzer

摘要

Catalytic cracking of C-12-C-32 hydrocarbons as model compounds was performed using hierarchical zeolite-containing mesoporous silica and silica-alumina. Curie point pyrolyzer (CPP) was used as a new evaluation method of catalytic cracking. The activity and product selectivity using hierarchical catalysts were compared with those of zeolite-kaolin mixed catalyst. The conversion and gasoline yield were improved with increasing the number of carbon in raw materials, and alkene showed higher reactivity than alkane compared with the same carbon number. It was thought that the hierarchical catalysts, which had the larger amounts of mesopores, would show the higher gasoline yield and conversion than kaolin mixed catalysts. Regardless of the type of zeolite, the gasoline yield increased linearly with increasing the conversion. In contrast to this, Y-zeolite-containing catalysts exhibited the higher ratios of branched hydrocarbons probably because of the presence of its larger micropores.