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Catalysts 2016, 6(3), 36; doi:10.3390/catal6030036

Study of N2O Formation over Rh- and Pt-Based LNT Catalysts

1
Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, Via La Masa, 34, 20156 Milano, Italy
2
Laboratoire Catalyse et Spectrochimie, ENSICAEN, Université de Caen, CNRS, 6 Bd du Maréchal Juin, 14050 Caen, France
*
Authors to whom correspondence should be addressed.
Academic Editor: Michalis Konsolakis
Received: 11 January 2016 / Accepted: 17 February 2016 / Published: 1 March 2016
(This article belongs to the Special Issue Surface Chemistry and Catalysis)
View Full-Text   |   Download PDF [4513 KB, uploaded 1 March 2016]   |  

Abstract

In this paper, mechanistic aspects involved in the formation of N2O over Pt-BaO/Al2O3 and Rh-BaO/Al2O3 model NOx Storage-Reduction (NSR) catalysts are discussed. The reactivity of both gas-phase NO and stored nitrates was investigated by using H2 and NH3 as reductants. It was found that N2O formation involves the presence of gas-phase NO, since no N2O is observed upon the reduction of nitrates stored over both Pt- and Rh-BaO/Al2O3 catalyst samples. In particular, N2O formation involves the coupling of undissociated NO molecules with N-adspecies formed upon NO dissociation onto reduced Platinum-Group-Metal (PGM) sites. Accordingly, N2O formation is observed at low temperatures, when PGM sites start to be reduced, and disappears at high temperatures where PGM sites are fully reduced and complete NO dissociation takes place. Besides, N2O formation is observed at lower temperatures with H2 than with NH3 in view of the higher reactivity of hydrogen in the reduction of the PGM sites and onto Pt-containing catalyst due to the higher reducibility of Pt vs. Rh. View Full-Text
Keywords: lean NOx trap; N2O formation; NOx storage reduction; Pt-BaO/Al2O3; Rh-BaO/Al2O3 lean NOx trap; N2O formation; NOx storage reduction; Pt-BaO/Al2O3; Rh-BaO/Al2O3
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kubiak, L.; Matarrese, R.; Castoldi, L.; Lietti, L.; Daturi, M.; Forzatti, P. Study of N2O Formation over Rh- and Pt-Based LNT Catalysts. Catalysts 2016, 6, 36.

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