The Role of CeO₂-Doping of γ-Al₂O₃ on its Structural and Superficial Area

• Authors: K. Aribi , M. Ghelamallah , A. Bellifa , F. Bousehaba
• Languages of publication: EN

Abstracts

EN

A series of samples, noted Al_xCe_{1-x} has been prepared by hydrolysis, from γ-Al₂O₃ and CeO₂. These samples were calcined under air at 450, 900 and 1200°C, and then characterized by specific surface area, X-ray diffraction and thermoreduction programmed under H₂. Obtained results show that after calcination at 450 and 900°C, the cerium decreases the surface of alumina. Results of X-ray diffraction and thermoreduction programmed under H₂ experiments showed that the samples are constituted of: γ-Al₂O₃ and CeO₂. The global consumption of hydrogen increase with rate of CeO₂ added. At 1200°C, the sintering of the samples is very important and γ-Al₂O₃ is transformed into the α-phase. The decrease in specific surface area is more accentuated for Al₁Ce₀ sample, since sintering occurs due to the growth in crystallite size. Thermoreduction programmed under H₂ experiments show that reduction of CeO₂ much more accentuated for ceria samples or its decrease can reflect some alterations of the nature of interactions between Al₂O₃ and CeO₂.

Keywords

EN

γ-Al₂O₃; CeO₂; surface; structure; reducibility

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 132
• Issue: 3
• Pages: 445-447

Dates

published

2017-09

Contributors

author

K. Aribi

• Laboratoire de Matériaux, Applications et Environnement, Faculté des Sciences Exactes, Université Mustapha Stambouli, BP 305, Route de Mamounia, Mascara 29000, Algeria

author

M. Ghelamallah

• Laboratoire de Matériaux, Applications et Environnement, Faculté des Sciences Exactes, Université Mustapha Stambouli, BP 305, Route de Mamounia, Mascara 29000, Algeria

author

A. Bellifa

• Laboratoire de Matériaux, Applications et Environnement, Faculté des Sciences Exactes, Université Mustapha Stambouli, BP 305, Route de Mamounia, Mascara 29000, Algeria

author

F. Bousehaba

• Laboratoire de Matériaux, Applications et Environnement, Faculté des Sciences Exactes, Université Mustapha Stambouli, BP 305, Route de Mamounia, Mascara 29000, Algeria

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Identifiers

DOI

10.12693/APhysPolA.132.445