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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received April 10, 2010
Accepted May 14, 2010

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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H3PW12O40/SiO2 for sorbitol dehydration to isosorbide: High efficient and reusable solid acid catalyst

Peng Sun¹ Ding Hua Yu^{1 2} Yi Hu^{1 2} Zhen Chen Tang² Jiao Jiao Xia² Heng Li¹ He Huang^{1 2†}

¹College of Biotechnology and Pharmaceutical Engineering, Nanjing University of Technology, Nanjing 210009, China ²State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China

biotech@njut.edu.cn

Korean Journal of Chemical Engineering, January 2011, 28(1), 99-105(7), 10.1007/s11814-010-0324-2

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Abstract

Tungstophosphoric acids (PW) supported on various metal oxides (SiO2, γ-Al2O3, TiO2, ZrO2 and CeO2) were synthesized and used as catalysts for sorbitol dehydration to isosorbide for the first time. 30% PW/SiO2 exhibited the best catalytic performance for sorbitol dehydration, over which 56% isosorbide selectivity could be gained at a 95% sorbitol conversion at 250 ℃. The catalytic performance of regenerated 30% PW/SiO2 catalysts by dichloromethane elution showed no loss after recycling five runs. Characterizations with UV-Vis, XRD, NH3-TPD and thermal analysis techniques revealed that PW had a good dispersion, and the primary Keggin structure was preserved after supporting PW on different supports. The interaction between PW and oxides resulted in different acidity of catalysts, which affected conversion of sorbitol and selectivity for isosorbide. The final acidity order of supported PW catalysts was the following: SiO2>γ-Al2O3 >TiO2≠ZrO2>CeO2.

Keywords

Tungstophosphoric Acid Sorbitol Isosorbide Dehydration Regeneration

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