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Facile NOx interconversion over preoxidized Ag(111)

Simon Klacar (Institutionen för teknisk fysik, Kemisk fysik ; Kompetenscentrum katalys (KCK)) ; N. M. Martin ; J. Gustafson ; S Blomberg ; Z. Liu ; S. Axnanda ; R. Chang ; E. Lundgren ; Henrik Grönbeck (Institutionen för teknisk fysik, Kemisk fysik ; Kompetenscentrum katalys (KCK))
Surface Science (0039-6028). Vol. 617 (2013), p. 167-174.
[Artikel, refereegranskad vetenskaplig]

X-ray photoelectron spectroscopy and density functional theory calculations are used to investigate NO adsorption at low (100 K) and room temperature (RT) over preoxidized Ag(111). At 100 K, the data indicates presence of NO and N2O2, with little or no nitrite/nitrate formation. This is consistent with the calculated surface core level shifts and the pronounced barrier for nitrite formation. At RT, the recorded spectra indicate a complex interconversion between adsorbed species with an initial formation of a p(4 x 4) nitrate overlayer. With increasing NO pressure, the experimental results are best rationalized by partial nitrate decomposition into nitrites and subsequent NO physisorption, which leads to the formation of N2O3-like species.

Nyckelord: Density functional theory; Photoemission spectroscopy; Ag; Silver; Nitrogen oxides



Denna post skapades 2013-11-26. Senast ändrad 2016-11-21.
CPL Pubid: 187491

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kemisk fysik (1900-2015)
Kompetenscentrum katalys (KCK)

Ämnesområden

Kemisk fysik

Chalmers infrastruktur

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