Kyoto University · 재료과학
아스쿠라 교수의 연구실은 고해상도 XAS(엑스선 흡수 분광법)를 활용한 다이나믹한 촉매 거동 분석에 중점을 두고 있습니다. 특히 삼원 촉매 반응과 같은 복잡한 반응 조건에서의 Rh, La 등 전이금속의 산화 상태 변화와 전자 구조적 기여를 실시간으로 규명하고 있습니다. 이론적 계산과 실험 데이터의 융합을 통해 금속의 국소 구조와 전자 상태 간의 상관관계를 해석하는 데 특화되어 있습니다. 연구는 촉매 설계의 원리 규명과 고성능 촉매 개발에 기여하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
The dynamic behavior of Rh species in 1 wt% Rh/Al<sub>2</sub>O<sub>3</sub> catalyst during the three-way catalytic reaction was examined using a micro gas chromatograph, a NO<sub>x</sub> 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 s
La L1 and L3-edge X-ray absorption near-edge structure (XANES) of various La oxides were classified according to the local configuration of La. We found a correlation between both of the areas of the pre-edge peaks of the La L1-edge XANES spectra and the full width at half-maximum of white line of La L3-edge XANES spectra and the local configuration of La. Theoretical calculation of the XANES spectra and local density of states reveals the difference of La L1 and L3-edge XANES spectra of various
The characteristics of K-, L1-, and L3-edges of XANES (X-ray Absorption Near Edge Structure) spectra of group V, VI, and VII compounds, which have different coordination number, number of d electrons, and the coordination sphere symmetry, have been classified. Two p → d transitions were observed in the second derivative plots of the L3-edge XANES spectra for the group V, VI, and VII compounds. These two transitions can be assigned to split d orbitals. The splitting and area of the two white line
