NATURE OF SITES ON SILICA-ALUMINA FOR PROPYLENE POLYMERIZATION

被引:11
作者
FINCH, JN
CLARK, A
机构
[1] Phillips Petroleum Company, Bartlesville
关键词
D O I
10.1016/0021-9517(69)90386-8
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The nature of the sites on silica-alumina for propylene polymerization has been investigated using adsorption, deuterium tracer, and ammonia blocking techniques. Adsorption studies indicate that propylene, like 1-butene, rapidly undergoes polymeric complex formation which ceases after a few minutes. The polymeric complex remains adsorbed on catalyst sites. 1-Butene readily isomerizes over the propylene complex. Deuterium tracer studies indicate that little propylene isomerization occurs over silica-alumina at 25 °C. The ammonia blocking studies show that polymeric complex formation for propylene and 1-butene over silica-alumina is very similar. In both cases the average degree of polymerization is four. Catalyst sites of intermediate energy appear to be the most active in polymeric formation. © 1969.
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页码:147 / &
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