Catalytic performance of the dodecatungstophosphoric acid on different supports

Varying amounts of tungstophosphoric acid (HPW) have been supported on Y-type zeolite and silica using the incipient wetness method. The catalytic activity of the catalysts was studied in the vapor-phase dehydration of ethanol. The reaction was carried out in a conventional flow-type reactor under a...

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Published inApplied catalysis. A, General Vol. 256; no. 1-2; pp. 141 - 152
Main Authors Haber, J., Pamin, K., Matachowski, L., Mucha, D.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 30.12.2003
Subjects
Dehydration
Ethanol
Silica
Tungstophosphoric acid
Zeolite HY
Tungstophosphoric acid
Ethanol
Dehydration
Zeolite HY
Silica
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Summary:Varying amounts of tungstophosphoric acid (HPW) have been supported on Y-type zeolite and silica using the incipient wetness method. The catalytic activity of the catalysts was studied in the vapor-phase dehydration of ethanol. The reaction was carried out in a conventional flow-type reactor under atmospheric pressure at temperatures changing from 398 to 773K. Unexpectedly, deposition of heteropolyacid on zeolite HY with the loadings decreasing from 46.8 to 0.00016wt.% results in catalysts characterized by the same catalytic activity indicating that the catalytic behaviour is determined by few very active sites, composed of Keggin anions and lacunary Keggin anions located in the supercages opened at the surface, which has a honeycomb structure. Contrary to the series of HPW/Y catalysts, HPW supported on SiO2 shows decreasing catalytic activity when its concentration lowers, the monolayer being catalytically inactive in acid–base reactions.
ISSN:0926-860X
1873-3875
DOI:10.1016/S0926-860X(03)00395-8