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Issue 20, 2003
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Studying the NOx-trap mechanism over a Pt-Rh/Ba/Al2O3 catalyst by operando FT-IR spectroscopy

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Abstract

In situ FTIR spectroscopy coupled with mass spectrometry have been used to study the mechanism of nitrates formation and reduction over a common Pt-Rh/Ba/Al2O3 NOx storage catalyst. Our device consists of a transmission reactor cell (having a very small dead volume) dedicated to the evolution of surface species, and of a mass spectrometer combined with a FTIR micro-cell for gas analysis, allowing time resolved analysis in stationary and transient conditions. After studying the nitration properties of the catalysts under a lean flow, we have investigated its activity and selectivity in nitrate reduction under different reducing agents (CO, H2), using a rich mixture very close to the real composition too. The alternate exposure to rich and lean streams has allowed the identification of some steps in the reduction pathway, active sites, intermediate species and by-products for NOx-trap reaction. In particular we have differentiated the role of the support and the noble metal in the mechanism, as well as of isocyanate adspecies and ammonia among the detected species.

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Publication details

The article was received on 23 May 2003, accepted on 01 Aug 2003 and first published on 27 Aug 2003


Article type: Paper
DOI: 10.1039/B305874N
Citation: Phys. Chem. Chem. Phys., 2003,5, 4435-4440

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    Studying the NOx-trap mechanism over a Pt-Rh/Ba/Al2O3 catalyst by operando FT-IR spectroscopy

    T. Lesage, C. Verrier, P. Bazin, J. Saussey and M. Daturi, Phys. Chem. Chem. Phys., 2003, 5, 4435
    DOI: 10.1039/B305874N

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