Local structure analysis of oxygen storage promoters, CeO2-ZrO2
利用事例本文
In this solution, EXAFS method at Ce and Zr K-edges was applied to study local structure of CeO2-ZrO2 mixed oxide, oxygen storage promoters in automotive catalysts. The EXAFS method is a powerful technique to study local structure (distance, coordination number, species of neighbor atoms) of selected elements both in crystalline states and in non-crystalline states. Figure 1 shows radial structure function of Te atom after Fourier transform of Ce K-edge EXAFS spectra. Simultaneous analysis of EXAFS data set at 2 absorption edges revealed that homogeneous CeO2-ZrO2 solid solution (Fig. 2(c)) has high oxygen storage capacity.
Fig. 1 Radial structure function for Ce atom in CeO2-ZrO2 samples prepared by different methodologies.
Fig.2 Model structures of samples in Fig. 1.
[ Y. Nagai, T. Yamamoto, T. Tanaka, S. Yoshida, T. Nonaka, T. Okamoto, A. Suda and M. Sugiura, Journal of Synchrotron Radiation 8, 616-618 (2001), Fig. 3, 4, 6,
©2001 Internationa Union of Crystallography ]
学術利用キーワード
| A. 試料 | 無機材料 |
|---|---|
| B. 試料詳細 | 結晶性固体, 非晶質、ガラス |
| C. 手法 | 吸収、及びその二次過程 |
| D. 手法の詳細 | XAFS, EXAFS |
| E. 付加的測定条件 | 偏光（直線）, 室温 |
| F. エネルギー領域 | Ｘ線（4～40 keV), Ｘ線（>40 keV） |
| G. 目的・欲しい情報 | 化学状態, 結合状態, 局所構造, 機能構造相関, 機能発現 |
産業利用キーワード
| 階層1 | 機械, 金属, 環境, 化学製品, 工業材料, その他 |
|---|---|
| 階層2 | 触媒 |
| 階層3 | |
| 階層4 | 局所構造, 化学状態 |
| 階層5 | XAFS, NEXAFS |
問い合わせ番号
SOL-0000001206