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Structure-function ...
Structure-function relationship for alumina supported platinum during formation of ammonia from nitrogen oxide and hydrogen in presence of oxygen
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- Adams, Emma, 1989 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Merte, Lindsay R. (author)
- Lunds universitet,Lund University
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- Hellman, Anders, 1974 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Skoglundh, Magnus, 1965 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Gustafson, Johan (author)
- Lunds universitet,Lund University
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- Benedixen, Eva (author)
- Haldor Topsoe
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- Gabrielsson, Pär (author)
- Haldor Topsoe
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- Bertram, Florian (author)
- Lunds universitet,Lund University
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- Evertsson, Jonas (author)
- Lunds universitet,Lund University
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- Zhang, Chu (author)
- Lunds universitet,Lund University
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- Carlson, Stefan (author)
- Lunds universitet,Lund University
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- Carlsson, Per-Anders, 1972 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2016
- 2016
- English.
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In: Physical Chemistry Chemical Physics. - 1463-9084 .- 1463-9076. ; 18:16, s. 10850-10855
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Abstract
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- We study the structure-function relationship of alumina supported platinum during forma- tion of ammonia from nitrogen oxide and dihydrogen by employing in situ X-ray absorption and Fourier transformed infrared spectroscopy. Particular focus is directed towards the effect of increased levels of oxygen on the reaction as a model system for emerging technologies for passive selective catalytic reduction of nitrogen oxides. The suppressed formation of ammo- nia observed as the feed becomes net-oxidizing is accompanied by a considerable increase in the oxidation state of platinum as well as enhanced formation of surface nitrates and loss of NH-containing surface species. In the presence of (excess) oxygen, the ammonia formation is proposed to be limited by the weak interaction between nitrogen oxide and the oxidized platinum surface. This leads to slow dissociation rate of nitrogen oxide and thus low abun- dance of atomic nitrogen surface species that can react with adsorbed hydrogen atoms. 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- art (subject category)
- ref (subject category)
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- By the author/editor
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Adams, Emma, 198 ...
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Merte, Lindsay R ...
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Hellman, Anders, ...
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Skoglundh, Magnu ...
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Gustafson, Johan
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Benedixen, Eva
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show more...
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Gabrielsson, Pär
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Bertram, Florian
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Evertsson, Jonas
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Zhang, Chu
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Carlson, Stefan
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Carlsson, Per-An ...
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Materials Chemis ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
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Physical Chemist ...
- By the university
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Chalmers University of Technology