Recently
in-situ XAFS analysis of the catalysts under reaction conditions has widely been performed together with synchrotron radiation light sources of the 2nd−3rd generation. In some cases this method requires time-resolving analytical techniques such as DXAFS and QXAFS. In addition, design of the in-situ cell is crucial for obtaining spectra which properly reflect the structures of the catalysts under reaction conditions. Two kinds of
in-situ cells designed for experiments under high-pressure conditions are presented. Four of recent works are reviewed: Observation of Mo suboxide species during reduction of MoO
3, Cu
+ species formed in Cu-ZSM-5 during reduction process, structural change of Cu metal particles on Cu/ZnO under various reaction conditions, and Rh species during CO
2 hydrogenation. Intermediate species appearing in the course of chemical reactions have very short lives, therefore continuous observation of surface species by
in-situ method is indispensable for detection of such species. Moreover, the
in-situ method is the only way to obtain the structure of catalysts under the reaction conditions.
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