A catalytic composition for the selective oligomerization of ethylene and a process for preparing light linear (α-olefins, especially 1-hexene and 1-octene, starting from ethylene, using this composition, said composition comprising the following components: (A) a compound of a transition metal M of Group 4 of the periodic table; (B) an organic compound containing the sulfonic group (>SO
2
) bonded to two carbon atoms; (C) a hydrocarbyl organometallic compound of a metal M′ selected from elements of Groups 1, 2, 12, 13 or 14 of the periodic table; components (A), (B) and (C) being in such a quantity that the atomic ratios respectively of the metal M in (A), of the sulfur S in the sulfonic group of (B) and of the metal M′ in (C), respect the following proportions: S/M=(from 0 to 20)/1 and M′/M=(from 2 to 2000)/1, on the condition that when the compound of the metal M in component (A) is not a sulfonic complex of M, the S/M ratio is greater than 0.5, preferably greater than 1.
一种用于
乙烯选择性低聚的催化组合物,以及使用该组合物以
乙烯为原料制备轻线性(α-烯烃,特别是
1-己烯和 1-
辛烯)的工艺,所述组合物由以下组分组成:(A) 元素周期表第 4 族过渡
金属 M 的化合物; (B) 含
磺酸基(>SO
2
(C) 从元素周期表第 1、2、12、13 或 14 族元素中选出的
金属 M′的烃基有机
金属化合物;组分(A)、(B)和(C) 的数量应分别使(A)中
金属 M、(B)中
磺酸基中的
硫 S 和(C)中
金属 M′的原子比符合下列比例:S/M=(从 0 到 20)/1 和 M′/M=(从 2 到 2000)/1,条件是当组分(A)中
金属 M 的化合物不是 M 的
磺酸络合物时,S/M 比大于 0.5,最好大于 1。