Ethylene oligomerization to olefins on supported nickel catalyst

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" Ethylene oligomerization to olefins on supported nickel catalyst "
A. M. A. Sani

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	1113382
Doc. No	:	TLpq231530501
Main Entry	:	A. M. A. Sani
Title & Author	:	Ethylene oligomerization to olefins on supported nickel catalyst\ A. M. A. Sani
College	:	King Fahd University of Petroleum and Minerals (Saudi Arabia)
Date	:	1995
student score	:	1995
Degree	:	M.S.
Page No	:	146
Abstract	:	Ethylene oligomerization to olefins over supported nickel catalyst was studied in a fixed bed tubular reactor system. Nickel was supported on a prepared amorphous silica-alumina (ASA) by ion exchange and impregnation. Nitrogen was used for catalyst in-situ calcination, hydrogen for reduction and ethylene for reaction. Oligomerization experiments were carried out at various temperatures (100-300C), space velocities (2-6 h WHSV), 4 hours time-on stream for each run and a pressure of 500 psi. Catalyst performance, products distribution, and other side-by reactions were determined. The Ni-ASA (ion exchanged) was found to be more active than the Ni/ASA (impregnated) at the conditions operated. High olefins (oligomers) up to C were obtained at high temperatures (usd\geusd200C) and also at low temperature (150C) by extending the run period. All the catalysts tested were found to exhibit cracking activity as a result of the support acidity (Si/Al ratio) and at high temperature yielding some traces of paraffins. Increasing the space velocity at high temperature decreased catalyst performance as a result of the reduction in the contact time and lighter products were produced. Nickel was also supported on a prepared sodium silica-alumina (SSA) by ion exchange. This supported catalyst suppressed cracking activity by lowering the acidity of the support. Cobalt was used as a promoter on one of the prepared catalysts (Co/Ni-ASA) and it was found to be active. At low temperatures it produced about 12% paraffins. All the catalysts exhibited high selectivity to butene-1 at low temperatures (100-150C).
Subject	:	Applied sciences
	:	Chemical engineering