Abstract
The oligomerisation of ethylene into products in the C4±C20 range over heterogeneous nickel catalysts in a ®xed-bed reactor
at low temperature and high pressure (LT-HP) is reported. The catalysts were obtained by Ni(II) exchange or impregnation of
two differently prepared amorphous and mesoporous silica±alumina supports. A plot of catalytic activity versus temperature at
35 bar and MHSV2 produces a volcano-type curve with a maximum around 1208C. Experiments performed under the LT-HP
reaction conditions, viz. 1208C, 35 bar and MHSV2, give an ethylene conversion level of 99% and a 97% selectivity to
products with an even number of carbon atoms. The product spectrum (Cn distribution) was dependent on the type of catalyst
used, with the percentage of the C10 oligomers lying in the range 23±41% by mass. Of practical signi®cance, these types of
catalyst were found to be extremely stable in use showing no detectable drop in conversion after 108 days on stream under the
LT-HP reaction conditions employed.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:tut/oai:encore.tut.ac.za:d1001991 |
| Date | 15 January 1998 |
| Creators | Heveling, J, Nicolaides, CP, Scurrell, MS |
| Publisher | Elsevier |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Text |
| Format | |
| Rights | C 1998 Elsevier Science B.V. |
| Relation | Applied Catalysis A: General |
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