The reduction of NO by the CO produced by incomplete combustion in the flue gas can remove CO and NO simultaneously and economically. However, there are some problems and challenges in the industrial application which limit the application of this process. In this work, noble metal catalysts and transition metal catalysts used in the reduction of NO by CO in recent years are systematically reviewed, emphasizing the research progress on Ir-based catalysts and Cu-based catalysts with prospective applications. The effects of catalyst support, additives, pretreatment methods, and physicochemical properties of catalysts on catalytic activity are summarized. In addition, the effects of atmosphere conditions on the catalytic activity are discussed. Several kinds of reaction mechanisms are proposed for noble metal catalysts and transition metal catalysts. Ir-based catalysts have an excellent activity for NO reduction by CO in the presence of O2. Cu-based bimetallic catalysts show better catalytic performance in the absence of O2, in that the adsorption and dissociation of NO can occur on both oxygen vacancies and metal sites. Finally, the potential problems existing in the application of the reduction of NO by CO in industrial flue gas are analyzed and some promising solutions are put forward through this review.

中文翻译：

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气体净化用CO还原NO所用催化剂的综述。

烟道气中不完全燃烧产生的CO还原NO可以同时经济地去除CO和NO。但是，工业应用中存在一些问题和挑战，限制了该方法的应用。在这项工作中，对近年来用于CO还原NO的贵金属催化剂和过渡金属催化剂进行了系统的综述，强调了Ir基催化剂和Cu基催化剂的研究应用前景。总结了催化剂载体，添加剂，预处理方法和催化剂的理化性质对催化剂活性的影响。此外，讨论了气氛条件对催化活性的影响。对于贵金属催化剂和过渡金属催化剂，提出了几种反应机理。Ir基催化剂在O2存在下具有出色的CO还原NO的活性。铜基双金属催化剂在不存在O2的情况下表现出更好的催化性能，因为NO的吸附和离解可同时发生在氧空位和金属位点。最后，分析了工业烟气中CO还原NO所存在的潜在问题，并提出了一些有希望的解决方案。