过氧化氢
催化作用
解毒剂
环氧丙烷
选择性
纳米颗粒
化学
纳米技术
纳米团簇
材料科学
有机化学
毒性
激进的
环氧乙烷
共聚物
聚合物
作者
Qianhong Wang,Keng Sang,Changwei Liu,Zhihua Zhang,Wenyao Chen,Te Ji,Lina Li,Cheng Lian,Gang Qian,Jing Zhang,Xinggui Zhou,Yuan Wang,Xuezhi Duan
标识
DOI:10.1038/s41467-024-47538-4
摘要
Abstract The development of sustainable and anti-poisoning single-atom catalysts (SACs) is essential for advancing their research from laboratory to industry. Here, we present a proof-of-concept study on the poisoning of Au SACs, and the antidote of Au nanoparticles (NPs), with trace addition shown to reinforce and sustain propylene epoxidation. Multiple characterizations, kinetics investigations, and multiscale simulations reveal that Au SACs display remarkable epoxidation activity at a low propylene coverage, but become poisoned at higher coverages. Interestingly, Au NPs can synergistically cooperate with Au SACs by providing distinct active sites required for H 2 /O 2 and C 3 H 6 activations, as well as hydroperoxyl radical to restore poisoned SACs. The difference in reaction order between C 3 H 6 and H 2 (n C3H6 -n H2 ) is identified as the descriptor for establishing the volcano curves, which can be fine-tuned by the intimacy and composition of SACs and NPs to achieve a rate-matching scenario for the formation, transfer, and consumption of hydroperoxyl. Consequently, only trace addition of Au NPs antidote (0.3% ratio of SACs) stimulates significant improvements in propylene oxide formation rate, selectivity, and H 2 efficiency compared to SACs alone, offering a 56-fold, 3-fold, and 22-fold increase, respectively, whose performances can be maintained for 150 h.
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