Pd encapsulation in automotive exhaust-gas catalysts

Raman spectroscopy was used to detect strained PdO in fully formulated Pd-based automotive exhaust-gas catalysts that had been subjected to high-temperature accelerated aging treatments. The presence of strained PdO provides evidence of Pd encapsulation by ceria-zirconia, as in a previous study of a...

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Bibliographic Details
Published inApplied catalysis. A, General Vol. 252; no. 2; pp. 437 - 445
Main Authors Graham, G.W., O’Neill, A.E., Chen, A.E.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.10.2003
Elsevier
Subjects
Aging
Automotive exhaust-gas catalysts
Catalysis
Catalysts: preparations and properties
Ceria-zirconia
Chemistry
Encapsulation
Exact sciences and technology
General and physical chemistry
Palladium
Palladium oxide
Raman spectroscopy
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Encapsulation
Palladium oxide
Ceria-zirconia
Aging
Palladium
Automotive exhaust-gas catalysts
Raman spectroscopy
Platinoid Compounds
Deformation
Cerium oxide
X ray diffraction
Supported catalyst
Heterogeneous catalysis
Zirconium oxide
Transition metal compounds
Artificial ageing
Exhaust gas
Raman spectrometry
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Summary:Raman spectroscopy was used to detect strained PdO in fully formulated Pd-based automotive exhaust-gas catalysts that had been subjected to high-temperature accelerated aging treatments. The presence of strained PdO provides evidence of Pd encapsulation by ceria-zirconia, as in a previous study of a model powder catalyst. The relationship between strained PdO and Pd encapsulation was further examined for other model catalysts, and major factors influencing the application of this detection method were identified.
ISSN:0926-860X
1873-3875
DOI:10.1016/S0926-860X(03)00451-4