Time evolution of palladium structure change with redox fluctuations in a LaFePdO3 perovskite automotive catalyst by high-speed analysis with in situ DXAFS

Autor:	Yasuo Nishihata, Jun'ichiro Mizuki, Isao Tan, Masashi Taniguchi, Tetsuhiko Kobayashi, Hirohisa Tanaka, Mari Uenishi
Rok vydání:	2008
Předmět:	Chemistry Process Chemistry and Technology Analytical chemistry Time evolution chemistry.chemical_element Exhaust gas General Chemistry Redox Catalysis Crystal Chemical physics Absorption (electromagnetic radiation) Perovskite (structure) Palladium
Zdroj:	Catalysis Communications. 9:311-314
ISSN:	1566-7367
DOI:	10.1016/j.catcom.2007.05.041
Popis:	In the LaFePdO3 perovskite catalyst, redox fluctuations of the exhaust gas suppress the growth of particles of precious metal by causing Pd to move in and out of the perovskite crystal. To observe the real movements of Pd directly, the time evolution of local structure around Pd by redox fluctuations was investigated by in situ energy-dispersive X-ray absorption fine-structure (DXAFS) analysis with a 10 ms resolution. We proved that the change in structure of Pd is sufficiently fast to respond to the control frequency (1–4 Hz) of an actual gasoline engine and that the Pd particles that segregate out are extremely fine.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::308f1eaad9b1ee323b3ec8a2d642d141 https://doi.org/10.1016/j.catcom.2007.05.041 Zobrazit plný text záznamu Full Text from ScienceDirect