Oligomerization of isobutene on sulfated titania: Effect of reaction conditions on selectivity
2005
Abstract On sulfated titania prepared by gelling titanium alkoxide with sulfuric acid, isobutene oligomerization was carried out under different operating conditions. Under severe conditions [temperature 140 °C, pressure 600 psi and weight hourly space velocity (WHSV) of 2.5 h −1 ], the catalyst reached 100% isobutene conversion and selectivity for C 12 = and C 18 = olefins of 54 and 39%, respectively. Meanwhile, under soft conditions (28 °C, 100 psi and 10 h −1 ), conversion decreased from an initial value of 55–25% after 30 h on stream, while the selectivity for C 8 = increased from 42 to 60%. After 90 h on stream, catalyst activity was recovered by introducing nitrogen into the feed and the conversion then reached 90%. These results show that by varying the operating conditions over a sulfated titania catalyst, isobutene oligomerization can be controlled to the desired C 8 = or C 12 = olefin yield.
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