化学
乙烯
催化作用
取代基
甲基铝氧烷
磷化氢
位阻效应
胺气处理
选择性
降冰片烯
高分子化学
配体(生物化学)
有机化学
乙苯
药物化学
聚合物
共聚物
聚合
茂金属
生物化学
受体
作者
Mzamo L. Shozi,Xolelwa Zulu,Holger B. Friedrich
标识
DOI:10.17159/0379-4350/2022/v76a02
摘要
A series of phosphorus and nitrogen-based ethylene oligomerization ligands of the type Ph2PN(X)PPh2 where X = i-propyl, n-butyl, ethylbenzene and cyclohexyl substituents are reported. These ligands were functionalized to enable tethering on amino-silica. The free ligands, amino-silica and the tethered ligands were characterized by BET, XRD, IR, TGA and NMR. The catalysts were tested for ethylene oligomerization using Cr(acac)3 (acac = acetylacetonate) as the precursor and MMAO (modified methylaluminoxane) as the activator. The activity and selectivity of these catalysts to 1-octene was monitored at 45 bar ethylene in the temperature range of45-100 °C. The activity of the supported catalysts was comparable to their homogeneous counterparts, surpassing them in some cases and selectivities to 1-octene in the C8 products were as high as 99 wt%. The steric effect of the substituent on the ligand as well as that of the support was found to influence the activity and product distribution.
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