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Issue 3, 2002
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Chemical modification of high-quality large-pore M41S materials

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Abstract

M41S materials with a pore diameter of 80 Å and MCM-41 materials with a pore diameter of 30 Å were grafted with a variety of trimethoxysilanes and chlorosilanes. The obtained hybrid materials were characterised by thermogravimetric analysis, nitrogen adsorption measurements and multi nuclear MAS NMR. A comparison of grafting in the liquid and in the gas phase proved that the former method was more efficient: the amount of grafted material was about 20% higher. Of the 80 Å M41S and the 30 Å MCM-41 material, the former resulted in a higher loading of grafted species and a much larger free pore diameter after grafting. It is, therefore, the better starting material for grafting reactions. By optimising the liquid-phase synthesis the loading of grafted material could be increased by 30% compared to the standard method described in the literature. Furthermore, the degree of condensation of the grafted species was higher with the optimised method, as proven by 29Si MAS NMR.

Graphical abstract: Chemical modification of high-quality large-pore M41S materials

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Publication details

The article was received on 10 Oct 2001, accepted on 14 Nov 2001 and first published on 23 Jan 2002


Article type: Paper
DOI: 10.1039/B109205G
Citation: J. Mater. Chem., 2002,12, 528-533
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    Chemical modification of high-quality large-pore M41S materials

    B. Lindlar, M. Lüchinger, A. Röthlisberger, M. Haouas, G. Pirngruber, A. Kogelbauer and R. Prins, J. Mater. Chem., 2002, 12, 528
    DOI: 10.1039/B109205G

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