Recently, Fu Qiang, researcher of the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences and the research team of Bao Xinhe, successfully expanded and applied the metal-carrier strong interaction (SMSI) to the metal/carbide catalytic system, which proved the role of designing high-efficiency carbide-based catalytic materials. The important role. The relevant research results were published in J. Am. Chem. Soc.
Strong Metal-Support Interaction (SMSI) is an important concept in heterogeneous catalysis, which often leads to interface charge transfer, metal structure change, molecular adsorption modulation, etc., which ultimately affects the catalytic reaction. Performance, research on the role of SMSI mostly involves metal/oxide catalytic systems. Transition metal carbides possess the electronic properties of noble metals, which give them very unique catalytic properties.
The researchers obtained the Au/MoCx catalyst by carbonization starting from the Au nanoparticles supported on MoO3. Au exhibits a highly dispersed state, and there is charge transfer between Au and carbide carrier, and its low-temperature water-gas shift reaction activity is excellent, confirming the existence of SMSI between Au and MoCx carriers. It was found that the layered highly dispersed Au and the aggregated Au particles can be mutually converted by carbonization and oxidation treatment, and the dynamic SMSI interaction between the metal and the carbide carrier initiated by the cyclic carbonization-oxidation treatment is reported for the first time. In situ characterization techniques including XRD, XPS, XAFS, etc. were also used to investigate the dispersion mechanism of Au in the carrier carbonization process. It is proposed that the MoOxCy intermediate species is the key to disperse Au.
The research team successfully extended the metal-oxide interfacial effect to the metal/non-oxide catalytic system, which is of great significance for understanding the metal-support interfacial catalysis.
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