期刊
CATALYSIS COMMUNICATIONS
卷 9, 期 2, 页码 311-314出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.catcom.2007.05.041
关键词
perovskite catalyst; automotive catalyst; energy-dispersive X-ray absorption fine-structure
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 I'd 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. (C) 2007 Elsevier B.V. All rights reserved.
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