Faujasite type zeolites were synthesized from kaolin minerals. Zn, La and decationated zeolites were prepared by ion exchange with $ZnCl_2$, $LaCl_3$, $NH_4Cl$ aq. solution respectively. Catalytic activities of ion exchanged Faujasite type zeolites for 1-Butene cracking and isomerization were investigated.
(1-Butene $\to$ 2-Butene) reaction occurs easily on all zeolites, even though zeolites have few strong acid sites. Decationated zeolites have the highest catalytic activities for propylene formation, but as reaction temperature increases, the catalytic activities of La zeolites become equal to the catalytic activities of decationated zeolites. Catalytic activities of decationated zeolites and La zeolites for propylene for propylene formation increases with increasing degree of ion exchange, but at some degree of ion exchange they have the maximum values. For isobutylene formation catalytic activities of La zeolites are much higher then that of decationated zeolites. These phenomena suggest that another type of active site which is difficult to be formed on decationated zeolites surface, may be present on La zeolite surface. It is probably attributed to La ion and its electrostatic field.
Zn zeolite has lower catalytic activities in all cases, but catalytic activities of Zn zeolites increases with increasing degree of ion exchange.
