Structure-function relationship for alumina supported platinum during formation of ammonia from nitrogen oxide and hydrogen in presence of oxygen

Adams, Emma,1989Chalmers tekniska högskola,Chalmers University of Technology (författare)

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.

Merte, Lindsay R.Lunds universitet,Lund University (författare)
Hellman, Anders,1974Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)ahell (författare)
Skoglundh, Magnus,1965Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)skoglund (författare)
Gustafson, JohanLunds universitet,Lund University (författare)
Benedixen, EvaHaldor Topsoe (författare)
Gabrielsson, PärHaldor Topsoe (författare)
Bertram, FlorianLunds universitet,Lund University (författare)
Evertsson, JonasLunds universitet,Lund University (författare)
Zhang, ChuLunds universitet,Lund University (författare)
Carlson, StefanLunds universitet,Lund University (författare)
Carlsson, Per-Anders,1972Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)perc (författare)
Chalmers tekniska högskolaLunds universitet (creator_code:org_t)

Ingår i:Physical Chemistry Chemical Physics18:16, s. 10850-108551463-90841463-9076

Av författaren/redakt...: Adams, Emma, 198 ...; Merte, Lindsay R ...; Hellman, Anders, ...; Skoglundh, Magnu ...; Gustafson, Johan; Benedixen, Eva; visa fler...; Gabrielsson, Pär; Bertram, Florian; Evertsson, Jonas; Zhang, Chu; Carlson, Stefan; Carlsson, Per-An ...; visa färre...

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