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

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 H_2<

SUBMITTER: Fan Y 

PROVIDER: S-EPMC11001857 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature