Characterization of AlPO systems,precursors of the novel basic catalyst family AlPON |
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Authors: | J J Ben⩼ez M A Centeno J A Odriozola R Conanec R Marchand Y Laurent |
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Affiliation: | (1) Departamento de Química Inorgánica e Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Universidad de Sevilla-CSIC, PO Box 874, E-41080 Sevilla, Spain;(2) Laboratoire de Chimie des Matériaux,URA 1496 CNRS, Verres et Céramiques, Université de Rennes I, F-35042 Rennes Cedex, France |
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Abstract: | XPS and DRIFTS (diffuse reflectance infrared spectroscopy) spectra of AlPO systems, formally AlPO4-Al2O3, obtained by the sol-gel method have been studied in order to understand their geometric and electronic structure. Both DRIFTS and XPS demonstrate that the acidbase character of these samples depends on a structural modification. For low phosphorus content an amorphous spinel-like solid is proposed. This geometric arrangement alters the electronic density of oxide ions and phosphorus cations and hence their Lewis acid-base properties with respect to the amorphous solid having aluminium and phosphorus only in tetrahedral arrangement. |
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Keywords: | AlPO aluminum phosphate DRIFTS AlPON precursors |
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