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Yu, Baiyang; Cheng, Lu; Dai, Sheng; Jiang, Yongjun; Yang, Bing; Li, Hong; Zhao, Yi; Xu, Jing; Zhang, Ying; Pan, Chengsi; Cao, Xiao-Ming; Zhu, Yongfa; Lou, Yang
Advanced science, 09/2023, Volume: 10, Issue: 26Journal Article
Rationally constructing atom-precise active sites is highly important to promote their catalytic performance but still challenging. Herein, this work designs and constructs ZSM-5 supported Cu and Ag dual single atoms as a proof-of-concept catalyst (Ag -Cu /ZSM-5 hetero-SAC (single-atom catalyst)) to boost direct oxidation of methane (DOM) by H O . The Ag -Cu /ZSM-5 hetero-SAC synthesized via a modified co-adsorption strategy yields a methanol productivity of 20,115 µmol g with 81% selectivity at 70 °C within 30 min, which surpasses most of the state-of-the-art noble metal catalysts. The characterization results prove that the synergistic interaction between silver and copper facilitates the formation of highly reactive surface hydroxyl species to activate the C-H bond as well as the activity, selectivity, and stability of DOM compared with SACs, which is the key to the enhanced catalytic performance. This work believes the atomic-level design strategy on dual-single-atom active sites should pave the way to designing advanced catalysts for methane conversion.
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