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International Journal of Chemical Engineering
Volume 2017 (2017), Article ID 9136528, 8 pages
Research Article

Mesoporous (Ta, Nb)3W7 Modified with Stearic Acid Used as Solid Acids for Esterification

1Center for Research and Development of Fine Chemicals, State-Local Joint Laboratory for Comprehensive Utilization of Biomass, State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang 550025, China
2Institute of Comprehensive Utilization of Plant Resources, Kaili College, Kaili 556011, China
3Food and Pharmaceutical Engineering Institute, Guiyang College, Guiyang 550005, China

Correspondence should be addressed to Fei Chang

Received 29 November 2016; Revised 5 February 2017; Accepted 15 February 2017; Published 7 March 2017

Academic Editor: Oluwafunmilola Ola

Copyright © 2017 Fei Chang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Mesoporous solid acids Ta3W7 and Nb3W7 were prepared from TaCl5 and NbCl5 with WCl6 in the presence of stearic acid (SA) via a sol-gel method, respectively. For comparison, mesoporous Ta3W7-P123 mixed oxides and mesoporous Nb3W7-P123 mixed oxides were synthesized in the same way. The catalysts were characterized through TGA, XRD, SEM, TEM, BET, and NH3-TPD. Experimental results showed that Ta3W7-SA and Nb3W7-SA exhibited several advantages such as higher activity, shorter preparation period, lower cost, stronger acid sites, and higher surface area, which had potential to be used as mesoporous heterogeneous catalysts in biodiesel production.