Hybrid organic-inorganic xerogel access to meso- and microporous silica by thermal and chemical treatment

被引:44
作者
Boury, B
Chevalier, P
Corriu, RJP
Delord, P
Moreau, JJE
Chiman, MW
机构
[1] Univ Montpellier 2, Lab Chim Mol & Org Solide, UMR 5637, F-34095 Montpellier 5, France
[2] Univ Montpellier 2, Dynam Phases Condensees Grp, UMR 5581, F-34095 Montpellier 5, France
[3] Ecole Natl Super Chim, ESA 5076, Lab Chim Organomet, F-34296 Montpellier 5, France
关键词
D O I
10.1021/cm980519i
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Hybrid xerogels of general formula (O)(1,5)Si-C=C-(CH2)(n)-C=C-Si(O)(1,5) were prepared by sol-gel polycondensation in THF of the corresponding precursors (H3CO)(3)Si-C=C-(CH2)(n)-C=C-Si(OCH3)(3), without catalyst. Treatment of the hybrid xerogels was with methanol and water in the presence of 2.0% of ammonium fluoride as catalyst. For 2 < n < 4, elimination of the organic spacer was quantitatively achieved and the organic spacer was recovered in high yield. For n = 5, 6, and 8, increasing the length of the spacer results in a decreasing efficiency of this chemical treatment. Thermal oxidation at 600-680 degrees C of the hybrid xerogels was also performed and elimination of the organic spacer was obtained in all the cases. Mesoporous silica with a narrow pore-size distribution was obtained by chemical treatment of the xerogel with n = 2-4. Microporous silica was obtained by thermal treatment of the xerogel at 680 degrees C. All the materials were characterized by SAXS, BET, and spectroscopy analysis.
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页码:281 / 291
页数:11
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