涂覆型蜂窝体催化剂的制备与烟气一氧化碳催化净化性能

Preparation of coated honeycomb catalyst and carbon monoxide catalytic removal of flue gas

钢铁烧结烟气CO排放问题日渐被广泛关注,然而当前缺乏面向大流量烟气的高效实用型CO净化技术。将粉末催化剂涂覆到堇青石蜂窝陶瓷载体上制得了一系列涂覆型催化剂,基于系列表征技术分析了涂覆型催化剂的理化特性,并在实际烧结烟气条件下评测了CO催化性能。结果表明:浆液1wt‰聚乙烯醇含量与300℃焙烧可促进粉末催化剂在载体表面分布的均匀性,并提高了Mn^(4+)/Mn^(3+)与O_(ads)/O_(latt)比值;优选涂覆型催化剂经过60 min超声后的涂层脱落率为1.25%;在7500 h^(-1)空速、1%CO、8%水蒸气含量、110℃下可达到99%CO转化率,并在72 h内保持稳定;在基于某钢厂实际脱硫后的烧结烟气中,720 h后效率可稳定在82%以上。研究可为工业烟气CO净化技术的应用提供参考。

CO emission from iron and steel sintering flue gas has been paid more and more attention.However,there is a lack of efficient and practical CO removal technology for large flow flue gas.A series of coated catalysts were prepared by coating powder catalyst on cordierite honeycomb ceramic supports.The physicochemical properties of the coated catalysts were analyzed based on a series of characterization techniques,and the catalytic performance of CO was evaluated under actual sintering flue gas conditions.The results show that 1wt‰polyvinyl alcohol content of slurry and 300℃calcination could promote the uniformity of powder catalyst distribution on the surface of the support,and improve the ratio of Mn^(4+)/Mn^(3+)and O_(ads)/O_(latt).The coating shedding rate of the optimized coated catalyst is 1.25%after60 min ultrasonic vibration.The catalytic efficiency of 99%CO can be achieved at 7500 h^(-1)space speed,1%CO,8%water vapour content and 110℃,and remains stable within 72 h.Based on the actual desulfurization of sintering flue gas in a steel plant,the efficiency can be stable above 82%after 720 h.The study can provide reference for the application of CO removal technology for industrial flue gas.