Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 162, Issue -, Pages 75-84Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2014.06.036
Keywords
Tungsten; Zirconia; Esterification; Fatty acid
Funding
- CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior)
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- EPSRC [EP/G007594/4]
- Royal Society
- EPSRC [EP/G007594/4, EP/F063423/1, EP/G007594/3, EP/F063423/2] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F063423/1, EP/G007594/4, EP/G007594/3, EP/F063423/2] Funding Source: researchfish
Ask authors/readers for more resources
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 8.9 W nm(-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 degrees C increased surface acidity and hence catalytic activity. The formation of polymeric tungstate species on zirconia is necessary to generate the Bronsted acid sites responsible for palmitic acid esterification under mild conditions. (C) 2014 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available