首页|不同制备方法对钒基SCR催化剂脱硝性能的影响

不同制备方法对钒基SCR催化剂脱硝性能的影响

扫码查看
采用共混法、溶胶-凝胶法、水热法分别制得钒基催化剂前驱体,通过高温焙烧处理,制备系列钒基脱硝催化剂.研究制备方法和载体对钒基催化剂脱硝性能的影响,结果表明,采用常规共混法制备的VOx/TiO2-BM催化剂,无定型活性钒氧化物分散在锐钛矿TiO2载体中,在(200~400)℃有90%以上的脱硝活性;采用水热法制备的VOx/CeO2-HT催化剂,活性组分V与Ce通过固溶方式形成了CeVO4结构,其催化活性在(200~400)℃仅有70%~80%的脱硝效率;采用水热法制备的VOx/MnOx-HT催化剂,无定型活性钒氧化物分散在尖晶石Mn3O4载体中,在(220~400)℃的脱硝效率大于95%;采用溶胶-凝胶法制备的VOx/MnOx-SG催化剂,无定型活性钒氧化物分散在尖晶石Mn3O4和Mn2O3复合氧化物载体中,在(200~420)℃的脱硝效率大于95%,具有较高的脱硝活性和较宽的温度窗口,而且该催化剂表现出优异的抗水硫中毒能力和抗水硫中毒稳定性.不同制备方法制备的催化剂结构不同,载体种类对催化剂脱硝性能起着重要的作用,而且载体的结构对催化剂脱硝活性和稳定性影响较大.
Effect of different preparation methods on catalytic performance of vanadium-based catalysts for NH3-SCR
Vanadium based catalyst precursors were prepared by blending method,sol gel method and hydrothermal method,respectively,and calcined to get denitration catalyst.The effects of preparation methods and supports on the NH3-SCR performance of vanadium(V)based catalysts were studied.It was found that the VOx/TiO2-BM catalyst prepared by conventional blending method had amorphous active vanadium oxide dispersed in the anatase TiO2 carrier,with over 90% NOx conversion at(200~400)℃.The VOx/CeO2-HT catalyst prepared by hydrothermal method has CeVO4 structure formed by solid solu-tion of the active component V and Ce,and its catalytic activity is only 70%~80% of NOx conversion at(200~400)℃.The VOx/MnOx-HT catalyst is prepared by hydrothermal method,and amorphous active vanadium oxide is dispersed in spinel Mn3O4 support.The NOx conversion of VOx/MnOx-HT at(220~400)℃ is more than 95%.The VOx/MnOx-SG catalyst is prepared by sol-gel method,and amorphous active vanadium oxide is dispersed in spinel Mn3 O4 and Mn2 O3 composite oxide support,and it has high catalytic activity and a wide temperature window with the NOx conversionof more than 95% at(200~420)℃.Besides,VOx/MnOx-SG catalyst exhibits excellent resistance and stability against water vapor and sulfur poisoning.The results indicate that catalysts prepared by different methods have different struc-tures,and support plays an important role in the catalytic performance of the catalyst for NH3-SCR.Moreover,the structure of the support has a significant impact on the activity and stability of the cat-alyst for NH3-SCR.

catalyst engineeringblending methodsol-gel methodhydrothermal methodvanadium-based catalysts for SCRwide temperature window

李世豪、刘优林、沈岳松

展开 >

南京工业大学材料科学与工程学院,江苏南京 211816

催化剂工程 共混法 溶胶-凝胶法 水热法 钒基SCR催化剂 宽温度窗口

国家重点研发计划国家重点研发计划

2021YFB38020032022YFB3504102

2024

工业催化
西北化工研究院

工业催化

CSTPCD
影响因子:0.504
ISSN:1008-1143
年,卷(期):2024.32(4)
  • 21