The reporter learned from the Dalian Institute of Chemical Physics, Chinese Academy of Sciences on the 24th that the researchers of the institute discovered a copper catalyst that can replace the precious metal gold or silver. It shows completely different from the traditional copper catalyst in the catalytic hydrogenation reaction, but it is different from gold, The performance of silver is close, and related research results have recently been published in "Science-Progress".
The peripheral electronic structure of an atom often determines the chemical nature of the metal. Compared with gold and silver, non-noble copper of the same family is easier to obtain and cheaper, but because copper metal is more likely to lose peripheral electrons, it is also easier to be oxidized in catalytic reactions. In catalytic reactions such as oxidation or hydrogenation, metallic copper often exhibits a chemical state in which copper valence and monovalence coexist, so the chemical properties of copper catalysts are not stable.
In order to improve the stability of the copper catalyst, the research team of Sun Jian at the Dalian Institute of Chemical Physics, Chinese Academy of Sciences tried to change the external electronic structure of copper by means of "high-energy plasma flow bombardment", so that copper exhibited the characteristics of precious metals gold and silver. Gold and silver catalysts, this process of plasma flow bombarding copper to change its electronic structure has been compared by researchers to the "freezing" treatment of copper catalysts.
It is understood that "freezing" uses a magnetron sputtering device, driven by an electric field, through a high-energy particle flow generated by plasmaized argon gas, directional bombards a copper metal target, so that the metal copper is deposited uniformly on the carrier in the form of atoms surface.
The experimental results show that the "frozen" copper nanoparticles can be locked in the metallic state during the reaction, and the "frozen" copper nanoparticle catalysts during the reaction also exhibit catalytic performances very similar to the precious metal gold or silver, subverting The copper catalyst is beneficial to the traditional cognition of deep hydrogenation reaction to produce alcohol compounds such as ethylene glycol and ethanol, which proves that after treatment, copper metal can exhibit catalytic performance very similar to precious metal gold or silver. (Reporter Hao Xiaoming)
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