Transition metal-based catalysts for selective catalytic reduction of NO by CO: A state-of-the-art review

The selective catalytic reduction of NO by CO (CO-SCR) is a promising technology to simultaneously eliminate the harmful NO and CO. Particularly, low-cost and efficient catalysts for CO-SCR are in high demand for industrial applications. Transition metal-based catalysts (TMCs) are highly effective for CO-SCR, as reported over the past decade. This review aims to explore the latest advancements of TMCs in the CO-SCR reaction, focusing on Fe-, Cu-, Mn-, and Co-based catalysts. By combining the theoretical calculation and experimental results, we discuss the structure-performance relationships between TMCs and CO-SCR, the reaction pathways on various catalysts, and the impact of various implementation factors, such as O2, H2O, and SO2 concentrations, along with the catalyst design strategies. Finally, the opportunities and challenges of TMCs for CO-SCR reaction are predicted and discussed.