Mesoporous TMOS-MTMS copolymer silica gels catalyzed by fluoride

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Mesoporous HF-catalyzed tetramethoxysilane-methyltrimethoxysilane (TMOS-MTMS) copolymer silica gels with average pore diameter from 80 to 100 Å and narrow pore size distribution have been obtained. Mesoporous TMOS-MTMS copolymer gels with tetramethoxysilane ranging from 10% to 100% were also produced with tetrabutylammonium fluoride (TBAF) catalyst. The pore sizes of TBAF-catalyzed copolymer gels were controlled over a range from 25 to 194 Å. Their pore sizes increased with increasing fluoride content to R2=0.112 (R2, molarratio of F/Si) and then level off. The catalytic effect of fluoride on the sol-gel process was investigated. The results suggest that multi-fluorinated silicon species catalyze the silica polymerization. © 2001 Elvier Science B.V. All rights reserved.

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Journal of Non-Crystalline Solids

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