Influence of the preparation method on the surface properties and activity of alumina - supported gallium oxide catalysts
Capitolo
Data di Pubblicazione:
2002
Citazione:
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.
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.
Tipologia IRIS:
03 - Contributo in volume
Elenco autori:
A. Petre, B. Bonnetot, A. Gervasini, A. Auroux
Link alla scheda completa:
Titolo del libro:
Studies in Surface Science and Catalysis, Scientific Bases for the Preparation of Heterogeneous Catalysts, Vol. 143,