Physicochemical properties of WOx/ZrO2 catalysts for palmitic acid esterification

Vannia Cristina dos Santos, Karen Wilson, Adam F. Lee, Shirley Nakagaki*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

A series of WOx/ZrO2 with various tungsten loadings was prepared via incipient-wetness impregnation of zirconium hydroxide. The resulting thermally processed materials were characterised by XRD, XPS, porosimetry, NH3-TPD and pyridine FTIR spectroscopy to elucidate their composition, morphology and acidity, and subsequently tested in the esterification of palmitic acid with methanol. Catalytic performance was strongly dependent upon calcination temperature and W surface density. Esterification activity increased with increasing surface W density, reaching a maximum at 8.9Wnm-2 corresponding to near monolayer coverage. Subsequent growth of crystalline WO3 lowered activity, consistent with a decrease in the density of active surface sites. Calcination temperatures as high as 800°C increased surface acidity and hence catalytic activity. The formation of polymeric tungstate species on zirconia is necessary to generate the Brönsted acid sites responsible for palmitic acid esterification under mild conditions. © 2014 Elsevier B.V.

Original languageEnglish
Pages (from-to)75-84
Number of pages10
JournalApplied Catalysis B
Volume162
Early online date28 Jun 2014
DOIs
Publication statusPublished - Jan 2015

Bibliographical note

Funding: EPSRC (EP/G007594/4) for the award of a Leadership Fellowship, and the Royal Society for an Industry Fellowship

Keywords

  • esterification
  • fatty acid
  • tungsten
  • zirconia

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