Zirconium phosphate supported tungsten oxide solid acid catalysts for the esterification of palmitic acid

Katabathini N. Rao, Adapa Sridhar, Adam F. Lee, Stewart J. Tavener, Nigel A. Young, Karen Wilson

Research output: Contribution to journalArticlepeer-review

Abstract

A series of zirconium phosphate supported WOx solid acid catalysts with W loadings from 1–25 wt% have been prepared on high surface area zirconium phosphate by a surface grafting method. Catalysts were characterized by N2 adsorption, FTIR, Raman, UV-Vis, 31P MAS NMR, pyridine TPD and X-ray methods. Spectroscopic measurements suggest a Keggin-type structure forms on the surface of zirconium phosphate as a ([triple bond, length as m-dash]ZrOH2+)(ZrPW11O405−) species. All catalysts show high activity in palmitic acid esterification with methanol. These materials can be readily separated from the reaction system for re-use, and are resistant to leaching of the active heteropolyacid, suggesting potential industrial applications in biodiesel synthesis.
Original languageEnglish
Pages (from-to)790-797
Number of pages8
JournalGreen Chemistry
Volume8
Issue number9
Early online date28 Jun 2006
DOIs
Publication statusPublished - 2006

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