Catalytic Properties of Ag/Al2O3 Catalysts for Lean NOx Reduction Processes and Characterisation of Active Silver Species |
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| Authors: | A Iglesias-Juez M Fernández-García A Martínez-Arias Z Schay Zs Koppány AB Hungría A Fuerte JA Anderson JC Conesa and J Soria |
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| Affiliation: | (1) Instituto de Catálisis y Petroleoquímica, CSIC, Campus Cantoblanco, C/ Marie Curie, 28049 Madrid, Spain;(2) Institute of Isotope and Surface Chemistry, CRC, Hungarian Academy of Sciences, Budapest, Hungary;(3) Division of Inorganic and Physical Chemistry, University of Dundee, Scotland, UK |
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| Abstract: | A study of the lean NO
x
reduction activity employing different reductants over Ag/Al2O3 samples prepared from reverse microemulsions or impregnation with EDTA-complexes is presented. A multitechnique approach is employed for characterisation of the samples and/or processes taking place in the course of the NO
x
-SCR reaction with propene and propane. Results by in situ-DRIFTS reveal that, for the propene reductant, silver provides a new path for hydrocarbon activation involving generation of adsorbed acrylate species as a partially oxidised active intermediate, in line with previous proposals for other non-noble metal systems. It is shown, mainly on the basis of XAFS studies, that active silver species are related to well dispersed silver aluminate-like phases with tetrahedral local symmetry and a relatively high disorder in the oxygen first shell. |
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| Keywords: | NO
x
-HC-SCR Ag/Al2O3 catalysts in situ-DRIFTS XAFS UV– vis |
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