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Issue 3, 2015
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Comparative study of new chromium-based catalysts for the selective tri- and tetramerization of ethylene

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Abstract

Two new ligands, Ph2PN(iPr)P(Ph)N(c-Hex)(CH3) (2) (Ph = phenyl, iPr = isopropyl, c-Hex = cyclohexyl) and Ph2PN(c-Hex)P(Ph)NEt(CH3) (Et = ethyl) (3) were synthesized. 2 was characterized by X-ray analysis. To compare their applicability with the previously known Ph2PN(iPr)P(Ph)N(iPr)H (1) these ligands were investigated together with chromium(III)acetylacetonate, different co-catalysts and solvents for the catalytic oligomerization of ethylene. The in situ prepared catalysts proved to be highly active, yielding highly pure 1-octene as the main product and 1-hexene as the main byproduct. It was possible to reach productivities of several hundred kg product per gram chromium and hour, up to almost 65 wt% 1-octene with about 99% purity and overall 1-hexene plus 1-octene yields of more than 85 wt%.

Graphical abstract: Comparative study of new chromium-based catalysts for the selective tri- and tetramerization of ethylene

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Supplementary files

Article information


Submitted
04 Nov 2014
Accepted
11 Dec 2014
First published
11 Dec 2014

Catal. Sci. Technol., 2015,5, 1678-1682
Article type
Paper
Author version available

Comparative study of new chromium-based catalysts for the selective tri- and tetramerization of ethylene

S. Härzschel, F. E. Kühn, A. Wöhl, W. Müller, M. H. Al-Hazmi, A. M. Alqahtani, B. H. Müller, N. Peulecke and U. Rosenthal, Catal. Sci. Technol., 2015, 5, 1678
DOI: 10.1039/C4CY01441C

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