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Study of the effect of Ba loading for catalytic activity of Pt–Ba/Al2O3 model catalysts by L. Castoldi; I. Nova; L. Lietti; P. Forzatti is a Materials Science article available to read on EtoBox.

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A series of Pt-Ba/Al 2 O 3 NO x storage-reduction (NSR) catalysts having different Ba loadings (in the range 0-30%, w/w) have been prepared, characterized and tested in the NO x adsorption-reduction under realistic operating conditions. Accordingly, the role of the Ba loading on the storage of NO x and on their subsequent reduction has been addressed. The results indicated that the presence of Ba negatively affects both the catalyst morphological properties and the Pt dispersion in the samples with Ba loading higher than 10%, while a strong increase of the NO x adsorption capacity is observed. This effect has been associated to the involvement in the NO x storage process of Pt-Ba neighboring species. The analysis of the storage phase also showed that the highest the Ba content, the lowest the NO 2 concentration at catalyst saturation: this effect has been related to the decrease in the Pt content of the catalyst following Ba addition to the samples and/or to a possible masking of Pt sites when the Ba coverage approaches and exceeds the monolayer capacity of the support. Concerning the reduction phase, the data pointed out that for all the investigated catalysts the stored NO x spec

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Author

L. Castoldi; I. Nova; L. Lietti; P. Forzatti

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0920-5861)

Published

2004

Language

EN

Field

Materials Science (Physical Sciences)