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In situ observation of RedOx reactions of Pd/Sr-Fe-O catalysts for automotive emission

M Kimura1, K Uemura3, T Nagai3, Y Niwa4, Y Inada2 and M Nomura4

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We investigated the change in structures during reduction and oxidation of a new type of Pd on Sr-Fe-O catalyst for exhaust emission. In situ DXAFS techniques have shown changes in palladium states and oxygen concentration simultaneously during reduction and oxidation reactions. Quantitative analysis has shown that palladium atoms change their states between Pd(II*) and Pd(0) reversibly according to the gas atmosphere accompanying changes in the oxygen concentration. This reaction explains the high performance of the catalyst.


PACS

82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces

89.20.Kk Engineering

89.20.Bb Industrial and technological research and development

82.30.-b Specific chemical reactions; reaction mechanisms

82.80.Ej X-ray, Mössbauer, and other gamma-ray spectroscopic analysis methods

78.70.Dm X-ray absorption spectra

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Chemical physics and physical chemistry

Dates

Issue 1 (2009)



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