CATALYTIC ACTIVITIES OF PHOSPHATES FOR OLIGOMERIZATION OF LIGHT OLEFINS

Abstract

Among various phosphates tested, only BPO₄ was active for the oligomerization of n-olefins. The preadsorption of ammonia on BPO₄ caused the marked decrease in the activity, suggesting that the active sites are the acid sites. Acidic properties were observed on all the phosphates used. BPO₄ possessed both Lewis- and Brønsted-acid sites, but the other phosphates except for Ti(HPO₄)₂·H₂O had almost only Lewis-acid sites, suggesting that the acid sites which are essential for the oligomerization are of Brønsted type.