Redox behavior of surface-modified CeO{sub 2}-ZrO{sub 2} catalysts by chemical filing process
Surface modification of CeO{sub 2}-ZrO{sub 2} solid solutions took place using formation and transport of volatile vapor complexes such as AlCl{sub 3}-CeCl{sub 3} and AlCl{sub 3}-ZrCl{sub 4}, which was denoted as chemical filing. XPS analysis showed surface Ce enrichment, and transmission electron microscopy and Raman spectra revealed that a defective phase was formed on the surface of the samples by the chemical filing. The reduction temperature of the samples after the chemical filing was about 50 K lower than that of the fresh sample and further decreased by a reduction/reoxidation cycle. The redox property of the chemically filed sample was maintained even after the redox cycles at high temperatures, indicating its excellent durability compared to the solid solution prepared by a conventional procedure.
- Research Organization:
- Osaka Univ. (JP)
- OSTI ID:
- 20050857
- Journal Information:
- Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 3 Vol. 12; ISSN CMATEX; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
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