Low-temperature CO oxidation has been widely applied in environmental pollution control, but challenges remain in CO purification in high-humidity environments. In this study, the CuMnSn8 catalyst exhibited excellent low-temperature CO oxidation performance, achieving complete CO oxidation at temperatures below 55 °C in 85 % relative humidity. A series of characterizations indicated that an appropriate amount of SnO doping could promote the formation of more amorphous oxides, increase the oxygen species content, and facilitate the dispersion of Cu and Mn elements. The catalytic active sites for CO oxidation and the influence of SnO doping on the CO oxidation mechanism were investigated through in-situ DRIFTS experiments. The results indicated that Sn enhanced the synergistic effect between Cu and Mn, altered the pathway of CO oxidation reaction, generated more easily decomposable bidentate carbonate intermediates. This work provides insight into the design of CO oxidation catalysts with high activity in high humidity.

中文翻译：

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SnO2 改性 CuMnOx 催化剂用于湿 CO 低温氧化

低温CO氧化已广泛应用于环境污染控制，但高湿环境下CO净化仍面临挑战。在本研究中，CuMnSn8催化剂表现出优异的低温CO氧化性能，在低于55℃的温度和85%的相对湿度下实现了CO的完全氧化。一系列表征表明，适量的SnO掺杂可以促进更多非晶氧化物的形成，增加氧物种含量，并有利于Cu和Mn元素的分散。通过原位DRIFTS实验研究了CO氧化的催化活性位点以及SnO掺杂对CO氧化机理的影响。结果表明，Sn增强了Cu和Mn之间的协同作用，改变了CO氧化反应的途径，生成了更容易分解的二齿碳酸酯中间体。这项工作为高湿度下具有高活性的 CO 氧化催化剂的设计提供了深入的见解。