ZrO2-SO4 powders have been prepared by following either hydrothermal or room temperature precursor preparative routes and adopting different sulphation procedures. All the samples have been calcined at the same temperature (470 °C) and for the same time length (5 h), and have been characterized as to phase composition (XRD) and surface area (BET). The determinations of the actual acidity (pKa) and density of the oxide surface sites have been obtained by a revised Hammett-Bertolacini technique. The powder sulphur contents were obtained by elemental analyses. XPS analyses of the samples have been obtained by elaboration of the S 2p and Zr 3d spectral regions. XPS data are discussed with respect to the conditions of the powders preparation and cross-compared with acidity characterizations and sulphur contents.

Acidity, sulphur coverage and XPS analyses of ZrO2-SO4 powders by different procedures / S. Ardizzone, C.L. Bianchi. - In: APPLIED SURFACE SCIENCE. - ISSN 0169-4332. - 152:1(1999), pp. 63-69.

Acidity, sulphur coverage and XPS analyses of ZrO2-SO4 powders by different procedures

S. Ardizzone
Primo
;
C.L. Bianchi
Ultimo
1999

Abstract

ZrO2-SO4 powders have been prepared by following either hydrothermal or room temperature precursor preparative routes and adopting different sulphation procedures. All the samples have been calcined at the same temperature (470 °C) and for the same time length (5 h), and have been characterized as to phase composition (XRD) and surface area (BET). The determinations of the actual acidity (pKa) and density of the oxide surface sites have been obtained by a revised Hammett-Bertolacini technique. The powder sulphur contents were obtained by elemental analyses. XPS analyses of the samples have been obtained by elaboration of the S 2p and Zr 3d spectral regions. XPS data are discussed with respect to the conditions of the powders preparation and cross-compared with acidity characterizations and sulphur contents.
Acidity Calcination ; Density (specific gravity) ; Phase composition ; Sulfur dioxide ; X ray photoelectron spectroscopy ; Zirconia ; Hammett-Bertolacini technique ; Sulfation ; Powders
Settore CHIM/02 - Chimica Fisica
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/182151
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