B. Gergely et al., Multitechnique study of the interaction of SO2 with alumina-supported SnO2catalysts for lean NOx abatement, SURF INT AN, 30(1), 2000, pp. 61-64
This study deals with the physicochemical characterization of SO2-treated a
lumina-supported tin dioxide surfaces as a function of the tin oxide loadin
g. Three analysis techniques were used: Fourier transform infrared spectros
copy (FTIR), XPS and adsorption calorimetry, The two types of spectroscopie
s allowed the identification of the nature of the sulphur-containing specie
s after SO2 adsorption. The determination of the quantities of adsorbed sul
phur-containing species was made possible by adsorption calorimetry and XPS
, At 353 K the SO2 uptake was minimum for 8 wt,% Sn and the major species w
ere SO32-, When increasing the Sn Loading, the weakly adsorbed SO2 species
vanished whereas the amounts of sulphite species increased. Above 12 wt,% S
n, the presence of sulphate species increased, with a maximum for bulk SnO2
, After desorption at 673 K, the SO2 uptake was considerably decreased and
each sample presented more SO42- than SO32- species, Copyright (C) 2000 Joh
n Wiley & Sons, Ltd.