Cr(Ⅲ)-Based Catalyst System for Oligomerization of Ethylene to 1-Octene with High Selectivity

Abstract

Abstract: A four-membered catalyst system (chromium acetyl acetonate (Cr(acac)3)-diphosphinoamine-methylaluminoxane-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.

Key words: chromium acetyl acetonate, diphosphinoamine, methylaluminoxane, hexachloroethane, ethylene, oligomerization, octene

ZHANG Baojun;WANG Gang;WANG Sihan;ZHANG Deshun;WANG Yanji*. Cr(Ⅲ)-Based Catalyst System for Oligomerization of Ethylene to 1-Octene with High Selectivity[J]. Chinese Journal of Catalysis, 2007, 28(4): 317-320.

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https://www.cjcatal.com/EN/Y2007/V28/I4/317

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Cr(Ⅲ)-Based Catalyst System for Oligomerization of Ethylene to 1-Octene with High Selectivity

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