Enhancing SO2 Resistance of Mn−Ce−Co Loaded Activated Carbon Catalysts for Low‐Temperature NH3‐SCR: Insight into the Effect of Citrate Addition

Abstract The low‐temperature performance and ability to withstand SO 2 poisoning of catalyst are crucial factors in evaluating the NH 3 ‐SCR technology. In this study, honeycomb activated carbon loaded with Mn−Ce−Co catalysts was prepared using the citric acid complex impregnation method, simple impregnation and citric acid pre‐oxidation methods for low‐temperature NH 3 ‐SCR. The synergistic effect of citric acid and ternary metals results in catalysts prepared by the citric acid complex impregnation method exhibiting excellent redox properties and a high abundance of acidic sites. By increasing catalyst acidity and introducing CeO 2 sacrificial sites, the catalytic performance was improved, resulting in weaker adsorption capacity of the catalysts for SO 2 , enhancing SO 2 tolerance. The catalyst demonstrated 100 % NO x removal at 160 °C which remained stable even after a 100 ppm SO 2 pass for four hours. In addition, the catalyst showed good CO oxidation performance, with 78 % CO removal at 170 °C, which broadened the application scenario of the catalyst. This study highlights the denitrification effect of activated carbon supported Mn−Ce−Co ternary metal oxide catalysts and reveals the potential of multiple coupled approaches in improving the sulfur resistance of the catalysts.