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Energy Sources, Part A: Recovery, Utilization, and Environmental Effects Volume 34, 2012 - Issue 11
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Original Articles

The Synthesis of Methyl Oleate Catalyzed by Phosphotungstic Acid Immobilized on the Functionalized Palygorskite

L. X. Zhang Institute of Agricultural Products Processing, Henan Academy of Agriculture Sciences, Zhengzhou, Henan Province, P. R. China; State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, P. R. China
,
Q. Z. Jin State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, P. R. China
,
J. H. Huang State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, P. R. China
,
Y. F. Liu State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, P. R. China
,
L. Shan State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, P. R. China
&
X. G. Wang State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province, P. R. China
Pages 1037-1045 | Received 28 Jan 2010, Accepted 27 Feb 2010, Published online: 24 Apr 2012
 
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Abstract

Esterification of oleic acid with methanol was investigated using tungstophosphoric acid (H3PW12O40) immobilized on the 3-aminopropyltriethoxysilane (H2N(CH2)3Si(OC2H5)3) functionalized palygorskite. Among different loading catalysts, 15% (w/w) H3PW12O40 immobilized onto functionalized palygorskite showed stable and substantially high activity with about 90% oleic acid conversion. Immobilized catalysts were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, and temperature programmed desorption of NH3 for their surface element compositions and chemical states, crystallization, and acid strength, respectively. Characterization results indicated that H3PW12O40 was chemically and uniformly dispersed on modified palygorskite.

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