Journal
JOURNAL OF CATALYSIS
Volume 273, Issue 2, Pages 236-244Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2010.05.018
Keywords
Alumina; Tungsten oxide; Surface structure; Acidity; Infrared; CO adsorption; Lutidine adsorption; Raman; Propanol dehydration
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Funding
- Fondation Franco-Chinoise pour la Science et ses Applications (FFCSA)
- NSF of China [20803009]
- Total S.A
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The relationship between acidity, surface structure and catalytic activity for a series of WOx/Al2O3 catalysts was investigated. The catalysts, containing up to 4.1 atom W/nm(2), were prepared by incipient wetness impregnation and studied by N-2 physisorption, XRD, in situ Raman and infrared spectroscopy. The W phase was essentially present as surface species. Polymeric W surface species appeared above 1.4 atom W/nm(2); their abundance increased with W surface density. Lutidine and CO adsorption measurements, followed by infrared spectroscopy, evidenced the presence of relatively strong Bronsted acid sites. The development of these acid sites was similar to that of the abundance of polymeric W surface species. Similar evolution with W surface density was also observed for the activity for 2-propanol dehydration, an acid-catalyzed reaction, indicating a direct relationship between the abundance of polymeric W surface species, that of relatively strong Bronsted acid sites and the catalytic activity of WOx/Al2O3 catalysts. (C) 2010 Elsevier Inc. All rights reserved.
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