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Interaction of SO 2 with Different Polycrystalline Cu, Cu 2 O and CuO Surfaces
Author(s) -
Galtayries A.,
Grimblot J.,
Bonnelle J.P.
Publication year - 1996
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/(sici)1096-9918(199605)24:5<345::aid-sia126>3.0.co;2-2
Subject(s) - x ray photoelectron spectroscopy , crystallite , chemistry , adsorption , annealing (glass) , metal , desorption , chemical physics , analytical chemistry (journal) , chemical engineering , materials science , crystallography , metallurgy , organic chemistry , engineering
As SO 2 is a major atmospheric pollutant coming mainly from combustion and is also a reactant involved in reaction on catalysts, it is therefore of interest to undertake studies on the initial interaction of SO 2 with surfaces of metallic materials. In particular, this work deals with the study of species formed during the interaction of SO 2 with polycrystalline Cu° and corresponding oxides Cu 2 O and CuO. X‐ray photoelectron spectroscopy (XPS) permits the surface species present on these substrates to be identified. Evolution of these states upon annealing or by ion etching has also been followed by ion scattering spectroscopy and quadrupole mass spectrometry, which permits the reinforcement of some conclusions about the mechanisms of adsorption–desorption, surface transformations and sulphur location with respect to the outermost layers. Five major sulphur‐containing species have been identified from the S 2p binding energy (BE) S(ads), SO 2 (ads), SO 3 (ads), SO 4 (ads) and SO 2 (condensed). Upon annealing the substrates, transformations into S(ads), a sulphide‐like species (S 2p BE=162.0 eV), have always been observed. This state has already been identified during exposure of the above‐mentioned substrates with H 2 S [ Surf . Interface Anal . 23, 171 (1995)] but reactivity with SO 2 is far less important than with H 2 S on the same substrates.