Aluminum impregnated silica catalyst for Friedel-Crafts reaction:Influence of ordering mesostructure

doi:10.1016/j.cjche.2016.11.005

Abstract

Abstract: Friedel-Crafts alkylation of benzene with linear chain olefin (C₁₀-C₁₄), which is an important reaction of synthetic detergent, was studied via different catalysts of aluminum impregnated silica molecular sieves. AlCl3 was immobilized on silica molecular sieves with different channel structures, hexagonal packing channels network (SBA-15, MCM-41), and disordered channel network (SiO₂, SiO₂-Gel) by impregnation. XRD and N₂ adsorption-desorption isotherms confirmed that the specific mesoporous structures were maintained for order channel network catalyst after impregnation. Catalytic activities were investigated under different conditions. The influences of channel structure were discussed. The results showed that catalyst based on mesoporous like SBA-15 had the highest catalytic activities and 2-LAB selectivity compared with other catalysts in this work. The highest 2-LAB selectivity was nearly 50% when 1-dodecene conversion was nearly 100%. At low 1-dodecene conversion or higher benzene/1-dodecene molar ratio, 2-LAB selectivity was nearly 60%.

Key words: Friedel-Crafts, Alkylation, Aluminum, Catalyst, Molecular sieves

摘要： Friedel-Crafts alkylation of benzene with linear chain olefin (C₁₀-C₁₄), which is an important reaction of synthetic detergent, was studied via different catalysts of aluminum impregnated silica molecular sieves. AlCl3 was immobilized on silica molecular sieves with different channel structures, hexagonal packing channels network (SBA-15, MCM-41), and disordered channel network (SiO₂, SiO₂-Gel) by impregnation. XRD and N₂ adsorption-desorption isotherms confirmed that the specific mesoporous structures were maintained for order channel network catalyst after impregnation. Catalytic activities were investigated under different conditions. The influences of channel structure were discussed. The results showed that catalyst based on mesoporous like SBA-15 had the highest catalytic activities and 2-LAB selectivity compared with other catalysts in this work. The highest 2-LAB selectivity was nearly 50% when 1-dodecene conversion was nearly 100%. At low 1-dodecene conversion or higher benzene/1-dodecene molar ratio, 2-LAB selectivity was nearly 60%.

关键词: Friedel-Crafts, Alkylation, Aluminum, Catalyst, Molecular sieves

Yibo He, Qinghua Zhang, Xiaoli Zhan, Dangguo Cheng, Fengqiu Chen. Aluminum impregnated silica catalyst for Friedel-Crafts reaction:Influence of ordering mesostructure[J]. , 2017, 25(10): 1533-1538.

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