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Methanol Partial Oxidation Over Shaped Silver Nanoparticles Derived from Cubic and Octahedral Ag2O Nanocrystals

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Ag-catalyzed methanol partial oxidation is an important industrial catalytic reaction. Herein we report the morphology effect of Ag catalysts on the catalytic activity in methanol partial oxidation. Shaped Ag nanoparticles were prepared by reducing the cubic and octahedral Ag2O nanocrystals under methanol vapor atmosphere. Ag nanoparticles were observed to undergo serious restructuring during methanol partial oxidation, but Ag nanoparticles derived from octahedral Ag2O nanocrystals were found to be more intrinsically active than those derived from cubic Ag2O nanocrystals. Ex situ characterizations demonstrated the more facile formation of active oxygen species on Ag nanoparticles derived from octahedral Ag2O nanocrystals than on Ag nanoparticles derived from cubic Ag2O nanocrystals. Therefore, although undergoing serious restructuring under the harsh reaction conditions of methanol partial oxidation, the original morphology of Ag nanoparticles exerts strong influences on the structure and catalytic activity of restructured Ag nanoparticles. These results demonstrate that strong correlations between original surface structure and restructured surface structure of catalyst nanoparticles even under very harsh reaction conditions and add fundamental understandings of methanol partial oxidation over Ag catalysts.

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Acknowledgements

This work was financially supported by the National Key R & D Program of MOST (Grant No. 2017YFB0602205), the National Natural Science Foundation of China (Grant Nos. 21525313, 91745202, 21703227), the Anhui provincial R&D key project, the Chinese Academy of Sciences, and the Changjiang Scholars Program of Ministry of Education of China.

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  1. Hefei National Laboratory for Physical Sciences at Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China, Jinzhai Road 96, Hefei, 230026, China

    Min Yang, Rui You, Dan Li, Zhenhua Zhang & Weixin Huang

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Yang, M., You, R., Li, D. et al. Methanol Partial Oxidation Over Shaped Silver Nanoparticles Derived from Cubic and Octahedral Ag2O Nanocrystals. Catal Lett 149, 2482–2491 (2019). https://doi.org/10.1007/s10562-019-02850-3

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