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

• Published in: Nature communications Vol. 15; no. 1; pp. 3046 - 10
• Main Authors: Fan, Yamei, Li, Rongtan, Wang, Beibei, Feng, Xiaohui, Du, Xiangze, Liu, Chengxiang, Wang, Fei, Liu, Conghui, Dong, Cui, Ning, Yanxiao, Mu, Rentao, Fu, Qiang
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 08.04.2024; Nature Publishing Group; Nature Portfolio
• Subjects: 140/133; 140/146; 140/58; 147/143; 639/301/299; 639/638/77/887; 639/925/357/354; Aluminum oxide; Atmosphere; Carbon monoxide; Catalysts; Cerium oxides; Copper; High temperature; Humanities and Social Sciences; multidisciplinary; Oxidation; Pushing; Room temperature; Science; Science (multidisciplinary); Silicon dioxide; Sintering; Species; Surface diffusion; Temperature; Temperature preferences; Transitional aluminas; Water gas
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-024-47397-z

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 O 2 -H 2 O treatment at room temperature. In-situ spectroscopic characterizations reveal that H 2 O induces the formation of hydroxylated Cu species in humid O 2 , pushing surface diffusion of Cu atoms at room temperature. Further, surface OH groups formed on most hydroxylable support surfaces such as γ-Al 2 O 3 , SiO 2 , and CeO 2 in the humid atmosphere help to pull the mobile Cu species and enhance Cu redispersion. Both pushing and pulling effects of gaseous H 2 O 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 H 2 O in the dynamic structure evolution of supported metal nanocatalysts and lay the foundation for the regeneration of sintered catalysts under mild conditions. Redispersion of sintered metal species requires high temperatures in reactive atmospheres. Here, the authors report room temperature redispersion of supported Cu particles via formation of mobile hydroxylated Cu species induced by gaseous H 2 O and anchoring of the Cu species by surface OH groups.