S. Liu et al. / Catalysis Today 200 (2013) 41–48
47
whereas the catalyst supported on silica showed catalytic activ-
ity for isobutene oligomerization. DSC and XPS characterization
results indicated that catalytic activity for isobutene oligomeriza-
−
tion might originate from the synergy between Al2Cl7 anion and
silica. Furthermore, the influences of temperature, reactant concen-
tration, space velocity and loading amount of the IL/silica catalysts
for the oligomerization were investigated. Optimized conditions
were observed at relatively high temperature, low space velocity,
and low isobutene concentration in the feed. Total conversion of
isobutene and 91.4% selectivity of trimers were obtained at 50 ◦C
over the IL/silica (30 wt.%) catalyst.
Acknowledgments
This work was supported by the financial support of National
Natural Science Foundation of China (Nos. 21103208 and
21173240).
Fig. 8. Effect of space velocity (GHSV) on the oligomerization of isobutene (catalyst:
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