Performance, reaction mechanism and modification methods for Mn-based CO-SCR catalysts: A review

Controlling nitrogen oxides (NO_x) emissions is increasingly important because of its multiple harmful effects on health and the environment. Carbon monoxide selective catalytic reduction (CO-SCR), a simple and low-cost technology for reducing NO_x through CO, is considered as a promising method for reducing NO_x and CO emissions from the industrial flue gases. As an environmentally friendly catalyst, manganese-based catalysts, which exhibit excellent NO conversion rate, have been extensively studied in NO reduction by CO. In this paper, the catalytic performance of Mn-based catalysts in CO-SCR and its influencing factors were reviewed, and the possible reaction mechanisms were discussed. In addition, different modification methods were used to improve the catalytic performance and anti-poisoning ability of Mn-based catalysts, so that the catalysts could maintain good catalytic performance in the presence of complex components such as oxygen, heavy metals, water vapor, and sulfur dioxide in the exhaust gas. Finally, further research on Mn-based CO-SCR catalysts was prospected.