As alumina seems to be the best support for gallium species in terms of activity in the reaction of NOx reduction by hydrocarbons, alumina-supported gallium oxide catalysts presenting similar surface areas were prepared by two different methods, an innovative pseudo sol-gel method and for comparison a conventional impregnation method. The bulk and surface compositions of the samples as well as their structural and textural features confirmed the better dispersion of the pseudo sol-gel sample. The acid-base properties of the samples were determined by adsorption microcalorimetry of ammonia and sulfur dioxide. The sample prepared in non-aqueous mixture showed a more homogeneous distribution of the acid sites, accompanied by an increase of the acid strength and a decrease of the number of basic sites. Moreover the catalytic activity for NOx reduction by ethene in oxygen excess was superior for the sol-gel sample. It is likely that this better activity could be associated with the higher dispersive effect of this synthesis method.

Influence of the preparation method on the surface properties and activity of alumina - supported gallium oxide catalysts / A. Petre, B. Bonnetot, A. Gervasini, A. Auroux - In: Studies in Surface Science and Catalysis, Scientific Bases for the Preparation of Heterogeneous Catalysts, Vol. 143, / [a cura di] E. Gaigneaux, D.E., De Vos, P. Grange, P.A. Jacobs, J.M. Martens, P. Ruiz and G. Poncelet. - Amsterdam : Elsevier, 2002. - ISBN 0-444-51178-4. - pp. 747-755 (( convegno 8th International Symposium on Scientific Bases for the Preparation of Heterogeneous Catalysts tenutosi a LOUVAIN LA NEUVE, BELGIUM nel SEP 09-12, 2002.

Influence of the preparation method on the surface properties and activity of alumina - supported gallium oxide catalysts

A. Gervasini;
2002

Abstract

As alumina seems to be the best support for gallium species in terms of activity in the reaction of NOx reduction by hydrocarbons, alumina-supported gallium oxide catalysts presenting similar surface areas were prepared by two different methods, an innovative pseudo sol-gel method and for comparison a conventional impregnation method. The bulk and surface compositions of the samples as well as their structural and textural features confirmed the better dispersion of the pseudo sol-gel sample. The acid-base properties of the samples were determined by adsorption microcalorimetry of ammonia and sulfur dioxide. The sample prepared in non-aqueous mixture showed a more homogeneous distribution of the acid sites, accompanied by an increase of the acid strength and a decrease of the number of basic sites. Moreover the catalytic activity for NOx reduction by ethene in oxygen excess was superior for the sol-gel sample. It is likely that this better activity could be associated with the higher dispersive effect of this synthesis method.
Settore CHIM/02 - Chimica Fisica
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/195885
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