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Issue 4, 2001
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A new molecular precursor for magnesia–silicamaterials

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The new molecular precursor Mg[OSi(OtBu)3]2 was synthesized in high yield from Mg(Bu)2 and HOSi(OtBu)3. Thermolytic decomposition of this precursor in toluene solution leads to a magnesia–silica monolith. The monolith can be processed to isolate xerogels or aerogels with surface areas of 245 and 640 m2 g−1, respectively. The MgO·2SiO2 materials are very acidic, as determined by ammonia temperature programmed desorption (TPD). Additionally, CO2 TPD revealed that these materials have a very low basic site density. The TPD results can be explained by a very high dispersion of MgO in an SiO2 matrix, and are consistent with predictions based on charge balancing in binary oxides.

Graphical abstract: A new molecular precursor for magnesia–silica materials

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Publication details

The article was received on 25 Sep 2000, accepted on 05 Dec 2000 and first published on 05 Mar 2001

Article type: Paper
DOI: 10.1039/B007742I
Citation: J. Mater. Chem., 2001,11, 1081-1085
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    A new molecular precursor for magnesia–silica materials

    J. W. Kriesel and T. D. Tilley, J. Mater. Chem., 2001, 11, 1081
    DOI: 10.1039/B007742I

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