Interaction of SO_2 with Oxygen on Ni(100) Studied by XPS and NEXAFS

摘要

The adsorption and surface reactions of SO_2 on Ni(100),c(2x2)_O/Ni (100) and NiO(111)/Ni(100) surfaces have been investigated using X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) technique.On Ni(100),chemisorbed SO_2 is formed at 160 K.When SO_2 is adsorbed on c(2x2)_O/Ni(100) at 160 K,SO_2 reacts with oxygen to form SO_3 and trace amount of SO_4 species.SO_3 is adsorbed on this surface with its C_3 axis perpendicular to the surface.On a NiO(111)/Ni(100) surface,both SO_3 and SO_4 species are formed at 160 K from adsorbed SO_2.