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Structure–activity relations in Cs-doped heteropolyacid catalysts for biodiesel production

Narasimharao, K., Brown, D.R., Lee, Adam F., Newman, A. D., Siril, P.F., Tavener, S.J. and Wilson, K. (2007) Structure–activity relations in Cs-doped heteropolyacid catalysts for biodiesel production. Journal of Catalysis, 248 (2). pp. 226-234. ISSN 00219517

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Abstract

A series of insoluble heteropolytungstate (H3PW12O40 HPW) salts, CsxH3−xPW12O40 (x=0.9–3), were synthesized and characterized using a range of bulk and surface sensitive probes including N2 porosimetry, powder XRD, FTIR, XPS, 31P MAS NMR, and NH3 calorimetry. Materials with Cs content in the range x=2.0–2.7 were composed of dispersed crystallites with surface areas 100 m2 g−1 and high Brönsted acid strengths [], similar to the parent heteropolyacid. The number of accessible surface acid sites probed by -pinene isomerization correlated well with those determined by NH3 adsorption calorimetry and surface area measurements. CsxH3−xPW12O40 were active toward the esterification of palmitic acid and transesterification of tributyrin, important steps in fatty acid and ester processing for biodiesel synthesis. Optimum performance occurs for Cs loadings of x=2.0–2.3, correlating with the accessible surface acid site density. These catalysts were recoverable with no leaching of soluble HPW.

Item Type: Article
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Schools: School of Applied Sciences
School of Applied Sciences > Materials and Catalysis Research Centre
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Corresponding author. Fax: +44 1904 432516

Depositing User: Sara Taylor
Date Deposited: 29 May 2008 11:41
Last Modified: 15 Sep 2010 12:35
URI: http://eprints.hud.ac.uk/id/eprint/778

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