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Article Dans Une Revue Applied Catalysis B: Environmental Année : 2013

NOx storage capacity of yttria-stabilized zirconia-based catalysts

Résumé

A NOx chemisorption study was performed on yttria-stabilized zirconia (YSZ), an O2- ionically conducting ceramic. NO2 chemisorption on YSZ as well as NO + O-2 interactions on Pt/YSZ catalyst were clearly correlated to the presence of surface oxygen vacancies. A remarkable NOx storage capacity was obtained on Pt/YSZ powdered catalysts, by combining nitrates formation and NO2 adsorption on oxygen vacancies. Under cycling conditions (lean phase/rich phase: 3 min/2 min) and using propene as a reductant, powdered Pt-Rh catalyst exhibited overall NOx abatement conversion of around 75% at 250 and 300 degrees C. Pt/Rh/YSZ catalysts were finely dispersed in the porosity of SiC mini diesel particulate filters (DPFs). Quite reproducible and stable NOx conversions were achieved in cycling conditions with values around 50% between 250 and 400 degrees C. In addition, YSZ-based catalysts have shown high thermal resistance and sulfur tolerance.

Domaines

Matériaux
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Dates et versions

hal-00850916 , version 1 (09-08-2013)

Identifiants

  • HAL Id : hal-00850916 , version 1

Citer

W. Y. Hernandez, A. Hadjar, M. Klotz, J. Leloup, A. Princivalle, et al.. NOx storage capacity of yttria-stabilized zirconia-based catalysts. Applied Catalysis B: Environmental, 2013, 130, pp.54-64. ⟨hal-00850916⟩
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