Lian Dianxing, Chen Mohaoyang, Wang Huanli, Li Chenxi, Dai Guiyao, Liu Botao, Hou Shujun, Zhang Weiwei, Wu Ke, Ji Yongjun
School of Light Industry Science and Engineering, Beijing Technology and Business University, Beijing, 100048, China.
Chem Asian J. 2024 Dec 2;19(23):e202400802. doi: 10.1002/asia.202400802. Epub 2024 Oct 29.
The technology of CO selective catalytic reduction of NO (CO-SCR) showcases the potential to simultaneously eliminate CO and NO from industrial flue gas and automobile exhaust, making it a promising denitrification method. The development of cost-effective catalysts is crucial for the widespread implementation of this technology. Transition metal catalysts are more economically viable than noble metal catalysts. Among these, Fe emerges as a prominent choice due to its abundant availability and cost-effectiveness, exhibiting excellent catalytic performance at moderate reaction temperatures. However, a significant challenge lies in achieving high catalytic activity at low temperatures, particularly in the presence of O, SO, and HO, which are prevalent in specific industrial flue gas streams. This review examines the use of Fe-based catalysts in the CO-SCR reaction and elucidates their catalytic mechanism. Furthermore, it also discusses various strategies devised to enhance low-temperature conversion, taking into account factors such as crystal phase, valence states, and oxygen vacancies. Subsequently, the review outlines the challenges encountered by Fe-based catalysts and offers recommendations to improve their catalytic efficiency for use in low-temperature and oxygen-rich environments.
一氧化碳选择性催化还原氮氧化物（CO-SCR）技术展现了从工业烟气和汽车尾气中同时消除一氧化碳和氮氧化物的潜力，使其成为一种有前景的脱硝方法。开发具有成本效益的催化剂对于该技术的广泛应用至关重要。过渡金属催化剂比贵金属催化剂在经济上更可行。其中，铁因其储量丰富且具有成本效益而成为突出选择，在中等反应温度下表现出优异的催化性能。然而，一个重大挑战在于在低温下实现高催化活性，特别是在特定工业烟气流中普遍存在的氧气、二氧化硫和水蒸气存在的情况下。本综述考察了铁基催化剂在CO-SCR反应中的应用，并阐明其催化机理。此外，还讨论了为提高低温转化率而设计的各种策略，同时考虑了晶相、价态和氧空位等因素。随后，该综述概述了铁基催化剂所面临的挑战，并提出了提高其在低温和富氧环境中催化效率的建议。
