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7907019 
Journal Article 
Aluminum impregnation into mesoporous silica molecular sieves for catalytic application to Friedel-Crafts alkylation 
Jun, SN; Ryoo, R 
2000 
Yes 
Journal of Catalysis
ISSN: 0021-9517
EISSN: 1090-2694 
Academic Press Inc. 
195 
2 
237-243 
English 
WOS:000090106500002 
The catalytic activity of mesoporous molecular sieves for Friedel-Crafts alkylation of toluene, benzene, and m-xylene with benzyl alcohol was measured with three kinds of materials, i.e., KIT-1, MCM-41, and MCM-48. The catalytic activity for the alkylation reaction depended on synthesis techniques rather than structural differences for MCM-48, MCM-41, and KIT-1. Mesoporous materials have about the same intrinsic surface nature with regard to the catalytic reaction. Postsynthesis impregnation of aqueous AlCl3 solution, followed by calcination, was the most effective means of increasing the catalytic activity. The Al sites generated were difficult to detect with magic angle spinning 27Al NMR unless the samples were adequately hydrated, supporting the possibility of three-coordinated catalytic sites. 
mesoporous materials; silica; Al incorporation; alkylation activity; acid catalysis