摘要
将四元催化剂体系(乙酰丙酮铬-膦胺型配体-助催化剂甲基铝氧烷-促进剂六氯乙烷)用于乙烯齐聚制1-辛烯反应,考察了促进剂、助催化剂、Al/Cr摩尔比、反应温度和反应压力等对催化剂的活性和1-辛烯的选择性的影响.结果表明,该四元催化剂体系比三元催化剂体系(铬化合物-膦胺型配体-甲基铝氧烷)对乙烯齐聚反应具有更高的1-辛烯选择性.产物除有1-辛烯外,还有较大量的1-己烯、甲基环戊烷和亚甲基环戊烷.甲基铝氧烷是高选择性生成1-辛烯必不可少的助催化剂.作为促进剂的六氯乙烷可以使乙酰丙酮铬更有利于催化乙烯齐聚反应生成1-辛烯.
A four-membered catalyst system （chromium acetyl acetonate （Cr（acac）3）-diphosphinoamine-methy- laluminoxane-hexachloroethane） was used in ethylene oligomerization. The effects of promoters, cocatalysts, and reaction conditions such as Al/Cr molar ratio, reaction temperature, and reaction pressure on its catalytic activity and selectivity for 1-octene were studied. The results showed that the four-membered catalyst system for ethylene oligomerization improved the selectivity for 1-octene evidently. Besides the target product 1-octene, main side-products such as 1-hexene, methylcyclopentane, and methylenecyclopentane were also valuable. Methylaluminoxane was an indispensable cocatalyst for producing 1-octene with high selectivity. Hexachloroethane showed a significant promotion effect on improving selectivity towards 1-octene over chromium centers.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2007年第4期317-320,共4页
基金
中国石油重点科技攻关项目（050402.18）.
关键词
乙酰丙酮铬
二苯基膦胺
甲基铝氧烷
六氯乙烷
乙烯
齐聚
辛烯
chromium acetyl acetonate
diphosphinoamine
methylaluminoxane
hexachloroethane
ethylene
oligomerization
octene
