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Article Dans Une Revue Top. Catal. Année : 2013

On the detrimental effect of tungstates on the n-C10-SCR of NOx on Ag/g-Al2O3

Résumé

The influence of the addition of W to Al2O3, promoted or not by Ag, on the n-C10 SCR of NOx was investigated. It was shown that the addition of W was detrimental to the n-C10 SCR reaction. Based on the NOx- TPD, the XPS and the n-C10 SCR measurements, it was concluded that the loss of activity observed at temperatures lower than 400 C on the Ag/W(5)–Al2O3 catalyst compared with the Ag/Al2O3 sample is likely due to the preferential deposition of Ag on the tungstate phase, making it inactive for the n-C10 SCR reaction which requires the active silver species to be in close contact with the Al2O3. At higher temperatures, the occupation, by the tungstates, of the Al2O3 sites responsible for the n-C10-SCR reaction is proposed to be an additional drawback accounting for the detrimental effect of W on Al2O3-supported catalysts promoted or not by Ag.

Domaines

Chimie

Dates et versions

hal-01121204 , version 1 (27-02-2015)

Identifiants

Citer

Juliette Blanchard, Rachel P. Doherty, Hiu Ying Law, Christophe Méthivier, Cyril Thomas. On the detrimental effect of tungstates on the n-C10-SCR of NOx on Ag/g-Al2O3. Top. Catal., 2013, Springer Science+Business Media New York 2013, pp.134-139. ⟨10.1007/s11244-013-9942-3⟩. ⟨hal-01121204⟩
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