学術雑誌論文 Dynamic Behavior of Rh Species in Rh/Al2O3 Model Catalyst during Three-Way Catalytic Reaction: An Operando X-ray Absorption Spectroscopy Study

Asakura, Hiroyuki  ,  Hosokawa, Saburo  ,  Ina, Toshiaki  ,  Kato, Kazuo  ,  Nitta, Kiyofumi  ,  Uera, Kei  ,  Uruga, Tomoya  ,  Miura, Hiroki  ,  Shishido, Tetsuya  ,  Ohyama, Junya  ,  Satsuma, Atsushi  ,  Sato, Katsutoshi  ,  Yamamoto, Akira  ,  Hinokuma, Satoshi  ,  Yoshida, Hiroshi  ,  Machida, Masato  ,  Yamazoe, Seiji  ,  Tsukuda, Tatsuya  ,  Teramura, Kentaro  ,  Tanaka, Tsunehiro

140 ( 1 )  , pp.176 - 184 , 2018-01-10 , American Chemical Society (ACS)
ISSN:0002-7863
内容記述
自動車排ガス浄化触媒における貴金属成分の酸化還元挙動の解明 --高輝度放射光を用いた触媒のリアルタイムモニタリング--. 京都大学プレスリリース. 2018-02-13.
The dynamic behavior of Rh species in 1 wt% Rh/Al2O3 catalyst during the three-way catalytic reaction was examined using a micro gas chromatograph, a NOx meter, a quadrupole mass spectrometer, and time-resolved quick X-ray absorption spectroscopy (XAS) measurements at a public beamline for XAS, BL01B1 at SPring-8, operando. The combined data suggest different surface rearrangement behavior, random reduction processes, and autocatalytic oxidation processes of Rh species when the gas is switched from a reductive to an oxidative atmosphere and vice versa. This study demonstrates an implementation of a powerful operando XAS system for heterogeneous catalytic reactions and its importance for understanding the dynamic behavior of active metal species of catalysts.
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http://repository.kulib.kyoto-u.ac.jp/dspace/bitstream/2433/229120/1/jacs.7b07114.pdf

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