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From China:Dalian Chemical Institute and others used Mossbauer spectrum technology to accurately characterize the purity of monatomic iron catalyst

Recently, Wang Junhu, a researcher of the Mossbauer Spectrum Technology Research Group, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and Dr. Jong-beom Baek and Dr. Gaofeng Han from ulsan national Institute of Science and Technology, South Korea, worked together. The purity of monatomic iron catalysts prepared by mechanical method was accurately characterized by the high energy resolution of Mossbauer spectroscopy.

Monatomic catalysts can be prepared by direct wear of transition metals such as bulk iron by means of mechanical chemistry. Compared with the traditional method, the preparation method has the following advantages: using cheap bulk metal as the base material, eliminating the use of metal salts; Do not use any solvents; No by-products were formed. However, there are still a few accidental nanoclusters in the monoatomic iron catalysts prepared by mechanical methods. These nanoclusters are difficult to be detected due to their small number and short range order, and it is also difficult to quantitatively and qualitatively analyze these clusters with high precision synchrotron radiation X-ray absorption fine structure spectroscopy (EXAFS). Although high Angle ring dark field scanning transmission electron microscopy and synchrotron radiation EXAFS show that Fe is distributed as a single atom, the coordination environment and whether all Fe is a single atom remain unclear.

In this study, Wang Junhu and his team used 57Fe Mossbauer spectroscopy to reveal the coordination environment of Fe monatomic catalyst (mainly Fe4N structure), and clearly detected a small number of Fe clusters that could not be determined by other methods, and identified as carbonized ferre (Fe3C, S1). It was found that after purification by heat treatment, even if only 4% Fe3C clusters in the sample could be easily detected. The results show that 57Fe mossbauer spectroscopy is a reliable and indispensable technique to accurately characterize the purity of Fe monatomic catalysts.

The findings, Abrading Bulk Metal into Single Atoms, have been published in Nature Nanotechnology. The research work was supported by the National Key RESEARCH and Development Program of China, the National Natural Science Foundation of China and the International Partnership Program of CAS.

Paper Link & NBSP;

Mossbauer spectroscopy technology is used to accurately characterize the purity of monatomic iron catalysts

Recently, Wang Junhu, a researcher of the Mossbauer Spectrum Technology Research Group, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and Dr. Jong-beom Baek and Dr. Gaofeng Han from ulsan national Institute of Science and Technology, South Korea, worked together. The purity of monatomic iron catalysts prepared by mechanical method was accurately characterized by the high energy resolution of Mossbauer spectroscopy.

Monatomic catalysts can be prepared by direct wear of transition metals such as bulk iron by means of mechanical chemistry. Compared with the traditional method, the preparation method has the following advantages: using cheap bulk metal as the base material, eliminating the use of metal salts; Do not use any solvents; No by-products were formed. However, there are still a few accidental nanoclusters in the monoatomic iron catalysts prepared by mechanical methods. These nanoclusters are difficult to be detected due to their small number and short range order, and it is also difficult to quantitatively and qualitatively analyze these clusters with high precision synchrotron radiation X-ray absorption fine structure spectroscopy (EXAFS). Although high Angle ring dark field scanning transmission electron microscopy and synchrotron radiation EXAFS show that Fe is distributed as a single atom, the coordination environment and whether all Fe is a single atom remain unclear.

In this study, Wang Junhu and his team used 57Fe Mossbauer spectroscopy to reveal the coordination environment of Fe monatomic catalyst (mainly Fe4N structure), and clearly detected a small number of Fe clusters that could not be determined by other methods, and identified as carbonized ferre (Fe3C, S1). It was found that after purification by heat treatment, even if only 4% Fe3C clusters in the sample could be easily detected. The results show that 57Fe mossbauer spectroscopy is a reliable and indispensable technique to accurately characterize the purity of Fe monatomic catalysts.

The findings, Abrading Bulk Metal into Single Atoms, have been published in Nature Nanotechnology. The research work was supported by the National Key RESEARCH and Development Program of China, the National Natural Science Foundation of China and the International Partnership Program of CAS.

Paper Link & NBSP;

Mossbauer spectroscopy technology is used to accurately characterize the purity of monatomic iron catalysts

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