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Recently, Shanghai Institute of Applied Physics, Shanghai Institute of Applied Physics, Shanghai Institute of Applied Light Sources and Energy, Rui Rui and Professor Jia Chunjiang of Shandong University and University of Science and Technology of China, Dr. Ma Chao cooperated in the study of the “structure-activity relationship†of catalysts and synchrotron radiation in situ X-ray technology. In combination, progress has been made in the identification of active species during small-scale gold-catalyzed room temperature carbon monoxide oxidation reactions. The relevant research results were published in the international journal Nature Communication (2016, 7, 13481).
Carbon monoxide oxidation (CO+O2→CO2) is an ideal catalytic model reaction and has been widely used to study the active species of oxide-supported metal catalysts and their catalytic “structure-activity relationshipâ€. Early results showed that the small size (<5nm) gold catalyst supported by cerium oxide has significant activity for carbon monoxide oxidation. However, the debate on gold active species has existed for a long time. Among them, the realization of the real sense of in-situ detection of the structural evolution of various gold species in the reaction process is the key to identifying active species. Based on the above issues, Si Rui and Jia Chunjiang, Ma Chao and other three groups work together to controllably load three different structures of gold species on the same type of cerium oxide nanorods, through spherical aberration correction high resolution transmission electron microscope ( Cs-corrected HRETM) and X-ray absorption fine structure spectroscopy (XAFS) characterization demonstrated that they were monodispersed Au atom, Au cluster less than 2 nm, and 3-4 nm Au particles. . Through in-situ XAFS, in situ X-ray diffraction (XRD) and in-situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) techniques, gold particles and gold clusters are clearly observed during the oxidation of carbon monoxide at room temperature. The presence of reduced gold (Au0) in the activity contributes much more to the oxidation state of gold (Aud+) present in the gold atom. This research work has important guiding significance in explaining the mechanism of the catalytic (carbon monoxide oxidation) reaction of the model.
Dr. Du Peipei, a doctoral student of the Shanghai Department of Light Source Materials and Energy, was the co-first author of the article. The relevant XAFS tests were performed on the Shanghai Light Source BL14W1 line station and the US NSLS light source X18B line station. This work was supported by the National Natural Science Foundation of China, the 100-person plan of the Chinese Academy of Sciences, and the strategic pilot nanometer project of the Chinese Academy of Sciences.
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