State Key laboratory of Heavy Oil, China University of Petroleum Beijing
Shandong Medicine and Food Vocational College

在燃煤、水泥以及垃圾焚烧处理厂等工况中,烟气中含有的水汽和SO2在低温条件下极易使催化剂中毒失活。因此如何解决低温抗水汽及SO2中毒成为一个亟待解决的关键技术难题。首先分析了NH3-SCR脱硝催化剂在工业低温环境中所面临的技术难点,包括水汽中毒和SO2中毒的机制,然后详细阐述了近年来提高催化剂抗水抗硫性能的研究策略。包括设计疏水涂层,利用元素协同作用改善催化剂表面电子结构等,以抑制SO2的吸附和氧化;设计酸性位点和氧化还原活性位点,以促进硫酸氢铵盐分解;添加牺牲剂,以提高催化剂的稳定性。最后,对提高抗中毒策略进行了总结与展望,旨在为低温高效、抗中毒能力强、使用寿命长的低温烟气脱硝催化剂设计与制备提供启示。

In coal-fired, cement and waste incineration plants, water vapour and SO contained in theflue gas could easily lead to poisoning and deactivation of the catalyst under low-temperature environ⁃ments. Therefore, addressing low-temperature anti-water vapour and SO poisoning has become a criti⁃cal technical challenge. Firstly, the technical difficulties faced by NH-SCR denitrification catalysts inindustrial low-temperature environments are analyzed, including the mechanisms of water vapour andSO poisoning, and then the research strategies to improve the water and SO resistance of catalysts inrecent years are elaborated in depth. It includes designing hydrophobic coatings and using elementalsynergism to improve the electronic structure of the catalyst surface, etc. to inhibit the adsorption andoxidation of SO; using acidic sites and redox-active sites to promote the decomposition of ammoniumbisulphate salts; and adding sacrificial agents to improve the stability of the catalyst. Finally, the strate⁃gies for improving the anti-poisoning were summarised and prospected, aiming to provide insights intothe design and preparation of low-temperature flue gas denitrification catalysts with high efficiency,strong anti-poisoning ability and long service life.

国家重点研发计划资助项目(2023YFB4004702,2022YFB3504103);国家自然科学基金资助项目(22272198)

孙海晓,赵儒霞,徐焘,等.低温烟气脱硝催化剂研究进展[J].能源环境保护,2024,38(4):78-87.

SUN Haixiao, ZHAO Ruxia, XU Tao, et al. Advances in low-temperature flue gas denitrification catalyst research[J]. Energy Environmental Protection, 2024, 38(4): 78-87.