Dynamic structural change in Pd-perovskite automotive catalyst studied by time-resolved dispersive X-ray absorption fine structure

Matsumura, Daiju ; Nishihata, Yasuo; Mizuki, Junichiro; Taniguchi, Masashi*; Uenishi, Mari*; Tanaka, Hirohisa*

The structural transformation of a Pd-perovskite automotive catalyst, LaFe $_{0.9}$ Pd $_{0.1}$ O $_{3}$ , which has a high catalytic activity during aging, was studied by in situ time-resolved dispersive X-ray absorption fine structure spectroscopy at 473-773 K. An Al $_{2}$ O $_{3}$ -based conventional catalyst was also studied. In a reductive atmosphere, both catalysts showed similar temperature dependences of structural transformation from an oxide to a metal. However, different temperature dependence was observed in an oxidative atmosphere. A faster response in the structural change was observed in the Pd-perovskite catalyst than in the Pd/Al $_{2}$ O $_{3}$ catalyst. It was revealed that Pd-perovskite shows a considerably fast structural change to the oxidized state via the movement of Pd atoms into the perovskite crystal, in comparison with Pd/Al $_{2}$ O $_{3}$ showing two-step structural change for making PdO.

Language	:	English
Journal	:	Journal of Applied Physics
Volume	:	107
Number	:	12
Pages	:	p.124319_1 - 124319_5
Publication Year/Month	:	2010/06
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Paper URL	:	https://doi.org/10.1063/1.3437084
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	no keyword
Research Facility	:	SPring-8(大型放射光施設)
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Cooperating Institute	:	ダイハツ工業

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Registration No. : AA20100186
JAEA Abstracts No. : 38001164
Paper Submission No. : 7815

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