Influence of Geometric Structure of Immobilized Aluminium Chloride Catalyst on Catalytic Property in

• 出 处: Chinese Chemical Letters
• 发表日期: 2001年07期
• 关键词: polymerization Friedel selectivity separate latter Figure diameters react identi

The catalytic property of AlCl_3 catalyst immobilized on γ-Al_2O_3 for isobutene polymerization has been studied. It was found that the activity, selectivity and stability of the catalyst are dependent greatly on geometric characteristic of the pore structure and size of catalyst. Although the activity and selectivity of the catalysts with micro- and meso-pore structure are all high in initial stage, but their stability is low, while those with bimodal meso- and macro-pore structure are excellent. Increasing granularity of the catalyst (particle become fine) brings about an increase in isobutene conversion, but a decrease in selectivity, resulting in lower average molecular weight and its broader distribution.

The was found in the activity, selectivity and stability of the catalyst are dependent greatly on geometric characteristic of the pore structure and size of catalyst. Although the activity and selectivity of the catalysts with micro- and meso-pore structures are all high in initial stages, but their stability is low, while those with bimodal meso- and macro-pore structures are excellent. Increasing granularity of the catalyst (particle become fine) about an increase in isobutene conversion, but a decrease in selectivity, resulting in lower average molecular weight and its broader distribution.