Reduction process of Pd-containing La-Fe perovskite-type oxides by in-situ Dispersive X-ray absorption spectroscopy

16th International Conference on X-ray Absorption Fine Structure

Uchiyama, T.^1 ; Kamitani, K.^2 ; Kato, K.^3 ; Nishibori, M.^4

Department of Molecular and Material Sciences, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka, Japan^1

Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka, Japan^2

Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo, Japan^3

Department of Energy and Materials, Faculty of Engineering Sciences, Kyushu University, Fukuoka, Japan^4

关键词: Mass spectroscopy;    Metal particle;    Perovskite structures;    Perovskite type oxides;    Reduction process;    Reductive atmospheres;    Strong metal support interaction;    X ray absorption fine structures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012043/pdf
DOI  :  10.1088/1742-6596/712/1/012043

来源: IOP

【 摘 要 】

Reduction process of Pd-containing La-Fe perovskites was investigated by in-situ Pd K-edge dispersive X-ray absorption fine structure as well as mass spectroscopy. The prepared perovskite was characterized by a conventional X-ray absorption spectra to confirm the incorporation of cationic Pd into perovskite matrix. Under the reductive atmosphere (5 vol%H2/He), we found the presence of three reduction processes of Pd cations in perovskite structure. The segregation of Pd metal particles was observed from 200-400oC although the cationic Pd species remained at 700oC due to the strong metal-support interaction.