Low-temperature CO oxidation on Ni(111) and on a Au/Ni(111) surface alloy.
From an interplay between scanning tunneling microscopy, temperature programmed desorption, X-ray photoelectron spectroscopy, and density functional theory calculations we have studied low-temperature CO oxidation on Au/Ni(111) surface alloys and on Ni(111). We show that an oxide is formed on both the Ni(111) and the Au/Ni(111) surfaces when oxygen is dosed at 100 K, and that CO can be oxidized at 100 K on both of these surfaces in the presence of weakly bound oxygen. We suggest that low-temperature CO oxidation can be rationalized by CO oxidation on O(2)-saturated NiO(111) surfaces, and show that the main effect of Au in the Au/Ni(111) surface alloy is to block the formation of carbonate and thereby increase the low-temperature CO(2) production.
Knudsen
Jan
J
Department of Physics and Astronomy, Aarhus University, Interdisciplinary Nanoscience Center, DK-8000 Aarhus C, Denmark.
Merte
Lindsay R
LR
Peng
Guowen
G
Vang
Ronnie T
RT
Resta
Andrea
A
Laegsgaard
Erik
E
Andersen
Jesper N
JN
Mavrikakis
Manos
M
Besenbacher
Flemming
F
D000327:Adsorption; D000497:Alloys / Q000737:chemistry*; D002248:Carbon Monoxide / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D009532:Nickel / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D011789:Quantum Theory; D013057:Spectrum Analysis; D013499:Surface Properties; D013696:Temperature
D000497:Alloys; D006046:Gold; D009532:Nickel; D002248:Carbon Monoxide; C028007:nickel monoxide; D010100:Oxygen