碱金属
催化作用
格式化
锆
选择性
铑
离子
Atom(片上系统)
无机化学
化学
材料科学
光化学
有机化学
计算机科学
嵌入式系统
作者
Li Shang,Yuxing Xu,Hengwei Wang,Botao Teng,Qin Liu,Qiuhua Li,Lulu Xu,Xinyu Liu,Junling Lu
标识
DOI:10.1002/anie.202218167
摘要
Tuning the coordination environments of metal single atoms (M1 ) in single-atom catalysts has shown large impacts on catalytic activity and stability but often barely on selectivity in thermocatalysis. Here, we report that simultaneously regulating both Rh1 atoms and ZrO2 support with alkali ions (e.g., Na) enables efficient switching of the reaction products from nearly 100 % CH4 to above 99 % CO in CO2 hydrogenation in a wide temperature range (240-440 °C) along with a record high activity of 9.4 molCO gRh-1 h-1 at 300 °C and long-term stability. In situ spectroscopic characterization and theoretical calculations unveil that alkali ions on ZrO2 change the surface intermediate from formate to carboxy species during CO2 activation, thus leading to exclusive CO formation. Meanwhile, alkali ions also reinforce the electronic Rh1 -support interactions, endowing the Rh1 atoms more electron deficient, which improves the stability against sintering and inhibits deep hydrogenation of CO to CH4 .
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