This paper reports data concerning the bulk and surface features of magnesia powders prepared by calcination of different precursor salts at increasing temperatures (873-1253K). The bulk characterization of the oxides has been obtained by X-ray diffraction, while the surface features have been investigated by means of N2 adsorption at subcritical temperatures and X-ray photoelectron spectroscopy. The acid/base features have been analysed by adsorption and step titration of dye indicators with known pK(b) values, in benzene.The powders appear to be composed of pure periclase, with a degree of crystallinity which is influenced by the nature of the precursor salt. The specific surface area and surface acid/base features of the samples are strongly dependent on both the nature of the precursor and the temperature of calcination. On the other hand, XPS data seem to be totally independent of the preparation route of the oxides, and acquire a general valence. Copyright (C) 1998 Elsevier Science B.V.

Acid/base and surface features of pure phase magnesia powders / S. Ardizzone,C.L. Bianchi, B. Vercelli. - In: COLLOIDS AND SURFACES. A, PHYSICOCHEMICAL AND ENGINEERING ASPECTS. - ISSN 0927-7757. - 144:1-3(1998), pp. 9-17.

Acid/base and surface features of pure phase magnesia powders

S. Ardizzone
Primo
;
C.L. Bianchi
Secondo
;
1998

Abstract

This paper reports data concerning the bulk and surface features of magnesia powders prepared by calcination of different precursor salts at increasing temperatures (873-1253K). The bulk characterization of the oxides has been obtained by X-ray diffraction, while the surface features have been investigated by means of N2 adsorption at subcritical temperatures and X-ray photoelectron spectroscopy. The acid/base features have been analysed by adsorption and step titration of dye indicators with known pK(b) values, in benzene.The powders appear to be composed of pure periclase, with a degree of crystallinity which is influenced by the nature of the precursor salt. The specific surface area and surface acid/base features of the samples are strongly dependent on both the nature of the precursor and the temperature of calcination. On the other hand, XPS data seem to be totally independent of the preparation route of the oxides, and acquire a general valence. Copyright (C) 1998 Elsevier Science B.V.
Acid/base features; MgO powders; Surface features
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/2434/182162
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