Abstract
Catalytic performance and structural suitability of immobilized AlCl3 catalyst for isobutene polymerization have been studied. It was found that the activity, selectivity and number-average molecular weight of the product polyisobutene depend, to a certain extent, on the pore structure and the granulation of the catalyst. AlCl3 on γ-Al2O3 support having macro- and meso-pore bimodal structure show excellent catalytic activity and high stability, while those on γ-Al2O3 with micro (d 15.6Å) and meso-pore (d 28.6Å) structure exhibit low stability and rapid fall of conversion with time. Granulation of the catalyst is also an important factor which affects activity and selectivity of the catalyst and average molecular weight of the product. Increasing granulation of the catalyst (particles become finer) brings about an increase in isobutene conversion, but a decrease in selectivity, resulting in lower average molecular weight and broader distribution.
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