Issue 9, 2003
From the journal:

Physical Chemistry Chemical Physics

Zirconia–aluminamixing in alumina-supported zirconia prepared by impregnation with solutions of zirconium acetylacetonate

Arnaldo C. Faro, Jr,*a   Kátia Regina Souza,a   Vera Lúcia D. L. Camorimb  and  Mauri B. Cardosob  

* Corresponding authors

a Departamento de Físico-Química, Instituto de Química, Universidade Federal do Rio de Janeiro, Ilha do Fundão CT bloco A, Rio de Janeiro, Brazil
E-mail: farojr@iq.ufrj.br
Fax: 5521 2562 7265
Tel: 5521 2562 7705

b PETROBRAS/CENPES/Tecnologia de Hidrorrefino e Processos Especiais, Ilha do Fundão Quadra 7, Rio de Janeiro, Brazil

Abstract

Materials containing 2–20 wt% zirconia supported on γ-alumina were prepared by multiple step incipient wetness impregnation with solutions of zirconium acetylacetonate in benzene. The materials were calcined at 823 K and were characterised by X-ray diffraction, XPS, DRS in the UV-visible region and FTIR in the regions of OH stretching and skeletal vibrations of adsorbed pyridine. The results demonstrated that the zirconium is present as isolated species at the surface and in the bulk of a mixed zirconia–alumina phase formed by migration of the zirconium ions into the subsurface layers of the support. The presence of zirconia at the alumina surface caused the appearance of basic hydroxyl groups bonded to a single zirconium ion, of weak Lewis acidic sites, probably associated with zirconium sites, and a decrease in concentration of stronger Lewis sites associated with the alumina surface.

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Article information

DOI
https://doi.org/10.1039/B300899A
Article type
Paper
Submitted
23 Jan 2003
Accepted
19 Mar 2003
First published
03 Apr 2003

Phys. Chem. Chem. Phys., 2003,5, 1932-1940

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Zirconia–alumina mixing in alumina-supported zirconia prepared by impregnation with solutions of zirconium acetylacetonate

A. C. Faro, Jr, K. Regina Souza, V. L. D. L. Camorim and M. B. Cardoso, Phys. Chem. Chem. Phys., 2003, 5, 1932 DOI: 10.1039/B300899A

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