Using the Interaction between Copper and Manganese to Stabilize Copper Single-atom for CO Oxidation.
Using the Interaction between Copper and Manganese to Stabilize Copper Single-atom for CO Oxidation.
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DOI：
10.1002/chem.202100442
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发表时间：
2021-04
期刊：
影响因子：
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通讯作者：
M. Jiang;Jing Chen-;Yanxia Gao;Xue Lv;Dongxu Yan;Hong-peng Jia
中科院分区：
文献类型：
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作者：
M. Jiang;Jing Chen-;Yanxia Gao;Xue Lv;Dongxu Yan;Hong-peng Jia
利用Cu和Mn之间的相互作用，通过氧化还原驱动的水解方法将Cu单原子吸附在MnO 2表面。综合结构和性能表征表明，催化剂表面Cu-Mn相互作用的存在能有效抑制Cu单原子的聚集，提高CO氧化活性。活性氧物种的迁移和活性中心的配位作用促进了反应的进行，形成Cu-O-Mn相互作用有利于CO催化活性的提高。其中，3%-Cu_（1/）MnO_2的储氧能力（342.75 μmol/g）是纯MnO_2（27.79 μmol/g）的10倍，CO活性高（T90% = 80 ℃），循环15次后，CO转化率仍保持在95%以上。本工作为合成Cu SACs提供了可靠的方法，加深了对过渡金属单原子与载体间相互作用提高CO氧化催化活性的认识。
The interaction between Cu and Mn was utilized to immobilize Cu single-atom on MnO2 surface by redox-driven hydrolysis method. Comprehensive structure and properties characterization demonstrate that the existence of Cu-Mn interaction on the catalyst surface can effectively restrain the aggregation of Cu single atoms and improve CO oxidation activity. The interaction of forming Cu-O-Mn entity is beneficial for CO catalytic activity since the migration of reactive oxygen species and the coordination effect of active centers accelerate the reaction. In particular, 3%-Cu1/MnO2 shows the more 10-fold oxygen storage capacity (OSC) value (342.75 μmol/g) than pure MnO2 (27.79 μmol/g) and performs the high activity of CO ( T90% = 80 oC), it can retain CO conversion of 95% after 15 times circulation. This work offers a reliable method for synthesizing Cu SACs and deepens the understanding of the interaction effect between transition metal single-atom and support that can improve the catalytic activity of CO oxidation.