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Remarkable stabilization of transition alumina operated by ceria under reducing and redox conditions

The thermal and structural stability under different atmospheres of a series of CeO2/Al2O3 supports with a range of composition containing 2–25% CeO2 was examined. It is shown that treatment under reducing conditions strongly affects stability in terms of surface area and phase distribution. Under o...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2000-11, Vol.28 (2), p.L77-L81
Main Authors: Piras, Alessandro, Trovarelli, Alessandro, Dolcetti, Giuliano
Format: Article
Language:English
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Summary:The thermal and structural stability under different atmospheres of a series of CeO2/Al2O3 supports with a range of composition containing 2–25% CeO2 was examined. It is shown that treatment under reducing conditions strongly affects stability in terms of surface area and phase distribution. Under oxidizing conditions at 1473K, ceria is almost totally ineffective as a stabilizing agent for alumina whereas under reducing and redox conditions, its effects are remarkably enhanced, and surface area in the order of 60m2/g can be retained after treatment at 1473K for several hours. This is directly related to the formation of Ce3+ present mainly as CeAlO3, which inhibits crystal growth and prevents formation of the α-alumina responsible for decrease in surface area.
ISSN:0926-3373
1873-3883
DOI:10.1016/S0926-3373(00)00226-5