低温NH_(3)-SCR反应中催化剂形貌效应的研究进展  

Research progress on morphology effect of catalysts in low temperature NH_(3)-SCR reaction

作　　者：谢巧 张雷 胡正华[1] 李艮香 王超越 李廷真 Xie Qiao;Zhang Lei;Hu Zhenghua;Li Genxiang;Wang Chaoyue;Li Tingzhen(College of Environmental and Chemical Engineering,Chongqing Three Gorges University,Chongqing 404000,China;Chongqing Key Laboratory of Water Environment Evolution and Pollution Control in the Three Gorges Reservoir,Chongqing Three Gorges University,Chongqing 404000, China)

机构地区：[1]重庆三峡学院环境与化学工程学院,重庆404000 [2]重庆三峡学院三峡库区水环境演变与污染防治重庆市重点实验室,重庆404000

出　　处：《工业催化》2021年第4期28-34,共7页Industrial Catalysis

基　　金：国家自然科学基金资助项目(21607019);重庆市教委科学技术研究项目(KJQN202001227)。

摘　　要：NH_(3)选择性催化还原(NH_(3)-SCR)是消除氮氧化物最主要的技术,相比于高温NH_(3)-SCR催化剂,低温NH_(3)-SCR催化剂由于其更广泛的应用范围,是目前该领域研究的重点。首先简单介绍低温NH_(3)-SCR脱硝技术应用背景,并指出目前存在的主要问题。然后分别从催化剂的孔结构、暴露晶面和特殊结构(核-壳、空心结构等)三个方面,综述形貌结构效应对催化剂在低温条件下的活性和抗硫抗水性能的研究进展。分析表明,通过对催化剂形貌结构进行优化,不仅可以调控催化剂的比表面积、表面活性位点(包括对活位点进行保护)和金属-载体间相互作用,还可以调节金属硫酸盐的吸附行为和硫酸氢铵在催化剂表面的分解行为,进而达到提高催化剂在低温条件下催化活性的目的。最后展望低温NH_(3)-SCR催化剂形貌效应的发展方向。Selective catalytic reduction with NH_(3)(NH_(3)-SCR)is the most important technology to eliminate nitrogen oxides.Compared with high-temperature NH_(3)-SCR catalyst,low-temperature NH_(3)-SCR catalyst is the focus of current research in this field due to its wider application range.The application background of low temperature NH_(3)-SCR is briefly introduced,and the existing main problems are put forward.Then,the effect of morphology including pore structure,exposed crystal plane and special structure(core-shell,hollow structure,etc.)on the activity,sulfur resistance and water resistance of catalyst at low temperature is reviewed.By optimizing the morphology and structure of catalyst,the specific surface area,surface active site(including the protection of the active site)and metal-carrier interaction of catalyst can be controlled,and the adsorption of metal sulfate and the decomposition of ammonium hydrogen sulfate on the surface of catalyst can be also adjusted,so as to improve the catalytic activity of catalyst at low temperature.Finally,the development direction of morphology effect for low temperature NH_(3)-SCR catalyst in the future is prospected.

关 键 词：催化化学 形貌结构 SCR催化剂 低温脱硝 抗硫中毒 纳米结构 

分 类 号：TQ426[化学工程] X701[环境科学与工程—环境工程]