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XPS study on barium‐promoted copper chromite catalysts
Author(s) -
Bianchi C. L.,
Cattania M. G.,
Ragaini V.
Publication year - 1992
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/sia.740190199
Subject(s) - barium , catalysis , x ray photoelectron spectroscopy , copper , chromium , oxidation state , chromite , chemistry , inorganic chemistry , cerium , incineration , nox , pollutant , materials science , metallurgy , chemical engineering , combustion , organic chemistry , waste management , engineering
Copper chromite catalysts are used nowadays in catalytic reactions during the incineration of organic air pollutants, which is a subject of growing interest in environmental safety. The aim of this work was to investigate by XPS the surface species, on a sample prepared by ourselves and to study the modifications of these species after various heat treatments. This study confirmed the deep surface transformation on the sample. We observed a complete reduction of the copper atoms from oxidation state II to I. In contrast, this behaviour is not followed by the chromium atoms, which are reduced to oxidation state III only to a small degree. This fact could be explained by the presence of barium which was introduced as a promoter in the catalyst.