Journal
APPLIED CATALYSIS A-GENERAL
Volume 192, Issue 1, Pages 57-69Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0926-860X(99)00333-6
Keywords
heteropoly acid; mesoporous materials; MAS NMR; FTIR; catalytic testing
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The potential of supported heteropoly acids (HPAs) is of great significance in acid catalysis. In this contribution, the HPA H3PW12O40 (PW) was impregnated into SiMCM-41 and the resulting PW/SiMCM-41 acidic system was investigated by means of spectroscopy (MAS NMR, FTIR) and catalytic testing. The complexation of PW with the SiMCM-41 hydroxyls is purported to enhance the acidity and catalytic activity of these silanols.:The effect of PW loading on structure, acidity and catalytic performance is monitored. The host material suffers severe structural distortions at higher loadings which lead to a considerable loss in the structural order. Based on these experimental findings, both acidity and catalytic performance were optimal with a loading of around 23 wt.% PW. (C) 2000 Elsevier Science B.V. All rights reserved.
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