Acid-base properties of MgCuAl mixed oxides

S. Casenave , Hervé Martinez (1) , Claude Guimon (2) , A. Auroux (3) , V. Hulea (4) , E. Dumitriu (5)

1 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux
2 LCTPCM - Laboratoire de Chimie théorique et Physico-chimie moléculaire
3 IRC - Institut de recherches sur la catalyse
4 ICGM ICMMM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
5 Tecnical University of Iasi

MgCuAl layered double hydroxides (LDHs) with a hydrotalcite like structure containing different proportions of Mg2+ and Cu2+ cations have been prepared. Thermogravimetry and X-ray diffraction data indicated that the transformation of LDH into mixed oxides is effective after calcination at 723 K, irrespective of the composition. The acid-base properties of these mixed oxides have been investigated using adsorption microcalorimetry and X-ray photoelectron spectroscopy with NH3 (for acidity) and SO2 (for basicity) as probe molecules. Their catalytic behaviour for the conversion of cyclohexanol has been tested. The acid-base properties and the selectivity of catalysts has been related to their composition.

Mots clés: Basicity; adsorption; Acidity; Calcination; Calorimetry; Microcalorimetry; MgCuAl mixed oxides; Magnesium copper aluminide; Magnesium compounds; Phase transitions; Oxides; Catalysis; Catalyst selectivity; Composition effects; Crystal structure; Cyclohexanol; Cyclohexanol conversion; layered double hydroxides; Thermogravimetric analysis; XPS; X ray diffraction analysis; X ray photoelectron spectroscopy

Domaines: Chimie; Matériaux

S. Casenave, Hervé Martinez, Claude Guimon, A. Auroux, V. Hulea, et al.. Acid-base properties of MgCuAl mixed oxides. Journal of Thermal Analysis and Calorimetry, 2003, 72 (1), pp.191--198. ⟨10.1023/A:1023980005672⟩. ⟨hal-01498395⟩