期刊
SOUTH AFRICAN JOURNAL OF CHEMISTRY-SUID-AFRIKAANSE TYDSKRIF VIR CHEMIE
卷 76, 期 -, 页码 9-+出版社
BUREAU SCIENTIFIC PUBL
DOI: 10.17159/0379-4350/2022/v76a02
关键词
1-hexene 1-octene; ethylene oligomerization; phosphine ligands; silica; supported catalysts
A series of phosphorus and nitrogen-based ethylene oligomerization ligands were reported, characterized, and tested for activity and selectivity towards 1-octene. The supported catalysts showed comparable activity to their homogeneous counterparts, with high selectivities to 1-octene in the C8 products.
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 of 45-100 degrees 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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