“…In previous studies, CO as a high ecological toxic pollutant was always eliminated by catalytic oxidation. , Currently, NO reduction with CO has been considered as an efficient process that was developed based on the three-way catalyst (TWC) technology and could remove two pollutants simultaneously without carbon deposits . Platinum group metals (PGMs) have been widely identified as one of the efficient catalysts for this reaction. − Unfortunately, the inevitable disadvantages restricted their widespread applications, such as high cost, limited resources, and low thermal stability . Therefore, it is highly desired to develop PGM-free catalysts, especially the transition metal oxides with robust performance and environmental friendliness in the NO reduction. − …”