OXIDATIVE DEHYDROGENATION OF ISOBUTYRIC ACID ON H4PVMO11O40, NAXH4-XPVMO11O40 AND CUYH4-2YPVMO11O40 HETEROPOLYACID CATALYSTS SUPPORTED ON SILICA

Authors
ABOUKAIS A GHOUSSOUB D BLOUETCRUSSON E RIGOLE M GUELTON M
Citation
A. Aboukais et al., OXIDATIVE DEHYDROGENATION OF ISOBUTYRIC ACID ON H4PVMO11O40, NAXH4-XPVMO11O40 AND CUYH4-2YPVMO11O40 HETEROPOLYACID CATALYSTS SUPPORTED ON SILICA, Applied catalysis. A, General, 111(2), 1994, pp. 109-118
Citations number
29
Categorie Soggetti
Chemistry Physical","Environmental Sciences
Journal title
Applied catalysis. A, General → ACNP
ISSN journal
0926860X
Volume
111
Issue
2
Year of publication
1994
Pages
109 - 118
Database
ISI
SICI code
0926-860X(1994)111:2<109:ODOIAO>2.0.ZU;2-8
Abstract
The oxidative dehydrogenation of isobutyric acid (IBA) to methacrylic acid (MAA) was studied over the heteropolyacid H4PVMo11O40 and the aci dic salts NaxH4-xPVMo11O40 and CuyH4-2yPVMO11O40, supported on silica, as catalysts. The presence of copper as counter-cations in the hetero poly compounds increases the activity and the selectivity to MAA. This increase is probably due to the simultaneous presence in the solids o f Bronsted acidity and oxygen vacancies with an adequate ratio. These latter sites can more easily be obtained in the presence of Cu2+ and V 4+ than with Na+ counter-ions in the catalysts.