山本旭先生、吉田寿雄先生(京大)およびJASRIとの共同研究の成果がJPC. C誌 (ACS)にAcceptされました。Our collaboration with Dr. Yamamoto and Prof. Yoshida (Kyoto Univ.), Dr. Kato (JASRI) was published in JPC C (ACS).

「Transient Temperature Response of Supported Rh Nanoparticles in Photothermal Dry Reforming of MethaneAn Operando Dispersive Xray Absorption Spectroscopy Study」Takami, Daichi; Yamamoto, Akira; Kato, Kazuo; Shishido, Tetsuya; Yoshida, Hisao

The Journal of Physical Chemistry C, 2022, 126, 37, 15736-15743, DOI: 10.1021/acs.jpcc.2c05291

Photothermal catalytic conversion of CO₂ is an effective strategy for solar energy storage and CO₂ utilization. The selective heating of metal nanoparticles (NPs) endows the high-temperature reaction field for CO₂ conversion; however, temperatures at the nanoscale under photothermal reaction conditions remain unrevealed. In this study, we performed operando dispersive X-ray absorption spectroscopy (DXAS) under concentrated visible and near-infrared light to evaluate the temperature of the catalytic active sites of Rh NPs on Al₂O₃ (local temperature) in the photothermal dry reforming of methane. The millisecond-order DXAS measurements demonstrated that the transient change in the local temperature of Rh NPs was affected by the formation process of the surface carbon-containing intermediates. The analysis methodology using operando time-resolved DXAS opens temperature evaluation at the nanoscale under light irradiation, including sunlight.