Water-assisted oxidative redispersion of Cu particles through formation of Cu hydroxide at room temperature

Yamei Fan, Rongtan Li, Beibei Wang, Xiaohui Feng, Xiangze Du, Chengxiang Liu, Fei Wang, Conghui Liu, Cui Dong, Yanxiao Ning, Rentao Mu and Qiang Fu ()
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Yamei Fan: University of Science and Technology of China
Rongtan Li: Chinese Academy of Sciences, Dalian Institute of Chemical Physics
Beibei Wang: ShanghaiTech University
Xiaohui Feng: University of Science and Technology of China
Xiangze Du: Chinese Academy of Sciences, Dalian Institute of Chemical Physics
Chengxiang Liu: Chinese Academy of Sciences, Dalian Institute of Chemical Physics
Fei Wang: Kunming University of Science and Technology
Conghui Liu: Chinese Academy of Sciences, Dalian Institute of Chemical Physics
Cui Dong: Chinese Academy of Sciences, Dalian Institute of Chemical Physics
Yanxiao Ning: Chinese Academy of Sciences, Dalian Institute of Chemical Physics
Rentao Mu: Chinese Academy of Sciences, Dalian Institute of Chemical Physics
Qiang Fu: Chinese Academy of Sciences, Dalian Institute of Chemical Physics

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Sintering of active metal species often happens during catalytic reactions, which requires redispersion in a reactive atmosphere at elevated temperatures to recover the activity. Herein, we report a simple method to redisperse sintered Cu catalysts via O2-H2O treatment at room temperature. In-situ spectroscopic characterizations reveal that H2O induces the formation of hydroxylated Cu species in humid O2, pushing surface diffusion of Cu atoms at room temperature. Further, surface OH groups formed on most hydroxylable support surfaces such as γ-Al2O3, SiO2, and CeO2 in the humid atmosphere help to pull the mobile Cu species and enhance Cu redispersion. Both pushing and pulling effects of gaseous H2O promote the structural transformation of Cu aggregates into highly dispersed Cu species at room temperature, which exhibit enhanced activity in reverse water gas shift and preferential oxidation of carbon monoxide reactions. These findings highlight the important role of H2O in the dynamic structure evolution of supported metal nanocatalysts and lay the foundation for the regeneration of sintered catalysts under mild conditions.

Date: 2024
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DOI: 10.1038/s41467-024-47397-z

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