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Issue 16, 2016
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The structure–function relationship for alumina supported platinum during the formation of ammonia from nitrogen oxide and hydrogen in the presence of oxygen

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Abstract

We study the structure–function relationship of alumina supported platinum during the formation of ammonia from nitrogen oxide and dihydrogen by employing in situ X-ray absorption and Fourier transform infrared spectroscopy. Particular focus has been directed towards the effect of oxygen on the reaction as a model system for emerging technologies for passive selective catalytic reduction of nitrogen oxides. The suppressed formation of ammonia observed as the feed becomes net-oxidizing is accompanied by a considerable increase in the oxidation state of platinum as well as the formation of surface nitrates and the loss of NH-containing surface species. In the presence of (excess) oxygen, the ammonia formation is proposed to be limited by weak interaction between nitrogen oxide and the oxidized platinum surface. This leads to a slow dissociation rate of nitrogen oxide and thus low abundance of the atomic nitrogen surface species that can react with the adsorbed hydrogen species. In this case the consumption of hydrogen through the competing water formation reaction and decomposition/oxidation of ammonia are of less importance for the net ammonia formation.

Graphical abstract: The structure–function relationship for alumina supported platinum during the formation of ammonia from nitrogen oxide and hydrogen in the presence of oxygen

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Publication details

The article was received on 10 Dec 2015, accepted on 30 Mar 2016 and first published on 30 Mar 2016


Article type: Communication
DOI: 10.1039/C5CP07624B
Citation: Phys. Chem. Chem. Phys., 2016,18, 10850-10855
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    The structure–function relationship for alumina supported platinum during the formation of ammonia from nitrogen oxide and hydrogen in the presence of oxygen

    E. C. Adams, L. R. Merte, A. Hellman, M. Skoglundh, J. Gustafson, E. C. Bendixen, P. Gabrielsson, F. Bertram, J. Evertsson, C. Zhang, S. Carlson and P. Carlsson, Phys. Chem. Chem. Phys., 2016, 18, 10850
    DOI: 10.1039/C5CP07624B

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