Reaction of NO on Vanadium Oxide Surfaces:Observation of the NO Dimer Formation

摘要

The adsorption and surface reactions of NO on a VO/V(110) surface have been investigated using X-ray photoelectron spectroscopy (XPS),near-edge X-ray absorption fine structure,and temperature programmed desorption (TPD) technique.NO is molecularly adsorbed on VO/V(l 10) at 80 K.As the surface coverage of NO increases,the NO dimer is formed on the surface at 80 K.Both NO and (NO)2 are adsorbed on the surface with the N-O bond perpendicular to the surface.(NO)2 decomposes at ~100 K and the reaction product is desorbed as N2O.Decomposition of NO takes place when the surface temperature is higher than 273 K.