Abstract: Isobutene oligomerization can be catalyzed by solid superacid SO42-/ZrO2 (SZ) at low temperature.A series of SO42-/ZrO2 (SZ) catalyst samples are prepared through direct precipitation impregnation method.The effects of liquid/solid impregnation ratio and concentration of sulfuric acid on SZ's catalytic performance are studied.The crystalline structure,acid amount and acid strength of the catalysts are characterized by XRD,NH3-TPD and TG.The results indicate that the liquid/solid impregnation ratio has a significant effect on the performance of SZ catalysts in catalyzing isobutene oligomerization.The resulting product has the highest pentamer selectivity when the liquid solid impregnation is 1.Strong acid center amount and monoclinic phase within the catalyst can be increased by lowing the concentration of sulfuric acid,which leads to great improvement of isobutene oligomerization performance of SZ catalysts.
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