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Multitechnique study of the interaction of SO 2 with alumina‐supported SnO 2 catalysts for lean NO x abatement
Author(s) -
Gergely B.,
Guimon C.,
Gervasini A.,
Auroux A.
Publication year - 2000
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 - 10.1002/1096-9918(200008)30:1<61::aid-sia813>3.0.co;2-3
Subject(s) - x ray photoelectron spectroscopy , adsorption , fourier transform infrared spectroscopy , chemistry , sulfur , nox , tin , calorimetry , desorption , catalysis , sulfur dioxide , inorganic chemistry , analytical chemistry (journal) , nuclear chemistry , chemical engineering , environmental chemistry , organic chemistry , combustion , physics , engineering , thermodynamics
This study deals with the physicochemical characterization of SO 2 ‐treated alumina‐supported tin dioxide surfaces as a function of the tin oxide loading. Three analysis techniques were used: Fourier transform infrared spectroscopy (FTIR), XPS and adsorption calorimetry. The two types of spectroscopies allowed the identification of the nature of the sulphur‐containing species after SO 2 adsorption. The determination of the quantities of adsorbed sulphur‐containing species was made possible by adsorption calorimetry and XPS. At 353 K the SO 2 uptake was minimum for 8 wt.% Sn and the major species were SO 3 2− . When increasing the Sn loading, the weakly adsorbed SO 2 species vanished whereas the amounts of sulphite species increased. Above 12 wt.% Sn, the presence of sulphate species increased, with a maximum for bulk SnO 2 . After desorption at 673 K, the SO 2 uptake was considerably decreased and each sample presented more SO 4 2− than SO 3 2− species. Copyright © 2000 John Wiley & Sons, Ltd.