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Catalysts 2016, 6(3), 46; doi:10.3390/catal6030046

Mechanistic Investigation of the Reduction of NOx over Pt- and Rh-Based LNT Catalysts

1
Laboratory of Catalysis and Catalytic Processes and NEMAS, Dipartimento di Energia, Centre of Excellence, Politecnico di Milano, via La Masa, 34-20156 Milano, Italy
2
Competence Centre for Catalysis, Chemical Engineering, Chalmers University of Technology, 412 96 Gothenburg, Sweden
*
Author to whom correspondence should be addressed.
Academic Editor: Jae-Soon Choi
Received: 30 January 2016 / Revised: 29 February 2016 / Accepted: 2 March 2016 / Published: 15 March 2016
(This article belongs to the Special Issue Automotive Emission Control Catalysts)
View Full-Text   |   Download PDF [1654 KB, uploaded 15 March 2016]   |  

Abstract

The influence of the noble metals (Pt vs. Rh) on the NOx storage reduction performances of lean NOx trap catalysts is here investigated by transient micro-reactor flow experiments. The study indicates a different behavior during the storage in that the Rh-based catalyst showed higher storage capacity at high temperature as compared to the Pt-containing sample, while the opposite is seen at low temperatures. It is suggested that the higher storage capacity of the Rh-containing sample at high temperature is related to the higher dispersion of Rh as compared to Pt, while the lower storage capacity of Rh-Ba/Al2O3 at low temperature is related to its poor oxidizing properties. The noble metals also affect the catalyst behavior upon reduction of the stored NOx, by decreasing the threshold temperature for the reduction of the stored NOx. The Pt-based catalyst promotes the reduction of the adsorbed NOx at lower temperatures if compared to the Rh-containing sample, due to its superior reducibility. However, Rh-based material shows higher reactivity in the NH3 decomposition significantly enhancing N2 selectivity. Moreover, formation of small amounts of N2O is observed on both Pt- and Rh-based catalyst samples only during the reduction of highly reactive NOx stored at 150 °C, where NOx is likely in the form of nitrites. View Full-Text
Keywords: NOx release; RhBa/Al2O3; PtBa/Al2O3; NOx storage reduction NOx release; RhBa/Al2O3; PtBa/Al2O3; NOx storage reduction
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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.; Castoldi, L.; Lietti, L.; Andonova, S.; Olsson, L. Mechanistic Investigation of the Reduction of NOx over Pt- and Rh-Based LNT Catalysts. Catalysts 2016, 6, 46.

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