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Selective catalytic reduction of NO<i>_x</i> by CO (CO-SCR) to both N₂ and CO₂ is a promising way to simultaneously remove two harmful gases, CO and NO<i>_x</i>, in automobile and factory exhaust gases. The development of efficient catalysts is the key challenge for the technology to be commercialized. The low-cost Cu-based catalysts have shown promising performance in CO-SCR, but there are some technical problems that obstruct their practical implementation, such as high reduction temperature and low O₂, H₂O, and SO₂ resistance. This paper provides a comprehensive overview and insights into CO-SCR under O₂-containing conditions over the Cu-based catalysts, including catalytic performances of non-supported, supported mono-metallic, supported bimetallic, and supported multi-metallic Cu-based catalysts. In addition, the effects of O₂ concentration, reaction temperature, H₂O, and SO₂ on the catalytic performance are discussed. Furthermore, the reaction mechanism of CO-SCR on Cu-based catalysts is briefly summarized. Lastly, challenges and perspectives with respect to this reaction are discussed. We hope this work can provide theoretical guidance for the rational design of efficient Cu-based catalysts in the CO-SCR reaction for commercial applications.