Letter
Effects of surface modification by chemical filing on the redox behavior of a ceria–zirconia mixed oxide

https://doi.org/10.1016/S0925-8388(99)00226-1Get rights and content

Abstract

A ceria–zirconia mixed oxide was prepared by means of the thermal decomposition of cerium zirconyl oxalate in an argon flow and subsequent removal of the top surface by the formation of volatile complexes of AlCl3–CeCl3 and AlCl3–ZrCl4, “chemical filing”. The obtained ceria-zirconia sample showed redox behavior at low temperatures even after redox cycles at 1273 K, while the conventional ceria–zirconia samples prepared via hydrogen or carbon reduction released a smaller amount of oxygen at higher temperatures after high temperature redox cycles. High redox activity at low temperatures and high thermal resistance are the requirements for the next generation of ceria-based materials, especially when applied in automotive exhaust cleaning catalysts.

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Acknowledgements

The authors thank the Shin-Nippon Kinzoku Kagaku Co., Ltd. for their assistance in supplying the starting materials. This work was supported by Grants-in-Aid for Scientific Research Nos. 10555304 and 11450335 from the Japan Society for the Promotion of Science. One of the authors (T.O.) is in receipt of a Research Fellowship of the Japan Society for the Promotion of Science for Young Scientists.

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