Unlocking the Potential of Metal-Doping Fe2O3/Rice Husk Ash Catalysts for Low-Temperature CO-SCR Enhancement

• Published in: ACS omega 2024-04, Vol.9 (14), p.16621-16630
• Main Authors: Pan, Yuqing, Li, Na, Wu, Chenyang, Zhou, Qulan, Li, Ke
• Format: Article
• Language: English
• ISSN: 2470-1343; 2470-1343
• DOI: 10.1021/acsomega.4c00593

Transition metal oxides are efficient bifunctional catalysts for the selective catalytic reduction (SCR) of nitrogen oxides (NO x ) using CO. Nonetheless, their poor activity at lower temperatures constrains broader industrial application. Herein, we propose an optimized Fe2O3-based catalyst through strategic metal doping with Cu, Co, or Ce, which engenders a harmonious balance for the synergistic removal of CO and NO x . Among the developed catalysts, Co-doped Fe2O3, supported by rice husk ash, demonstrates superior low-temperature CO-SCR activity, achieving CO and NO x conversion ratios and N2 selectivity above 98.5% at 100–500 °C. The enhanced catalytic performance is attributed to the catalyst’s improved redox properties and acidity, engendered by strong Fe–O x –Co interactions. Furthermore, the CO-SCR reaction adheres to the Langmuir–Hinshelwood and Eley–Rideal mechanisms. Our findings shed light on the future industrial application of low-temperature CO and NO x near-zero emission technology and provide a strategy for the design of low-cost SCR catalysts.