Facile NOx interconversion over preoxidized Ag(111)
Journal article, 2013
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.
Nitrogen oxides
Density functional theory
Ag
Photoemission spectroscopy
Silver
Author
Simon Klacar
Chalmers, Applied Physics, Chemical Physics
Competence Centre for Catalysis (KCK)
N. M. Martin
Lunds Universitet
J. Gustafson
Lunds Universitet
S. Blomberg
Lunds Universitet
Z. Liu
Lawrence Berkeley National Laboratory
S. Axnanda
Lawrence Berkeley National Laboratory
R. Chang
Lawrence Berkeley National Laboratory
E. Lundgren
Lunds Universitet
Henrik Grönbeck
Competence Centre for Catalysis (KCK)
Chalmers, Applied Physics, Chemical Physics
Surface Science
0039-6028 (ISSN)
Vol. 617 167-174Subject Categories (SSIF 2011)
Physical Chemistry
DOI
10.1016/j.susc.2013.07.004