摘要
添加不同表面活性剂聚乙烯醇、聚乙二醇4000、羧甲基纤维素配制涂覆浆液,制备堇青石蜂窝陶瓷负载的Fe-Mn/ZSM-5整体式催化剂.考察了不同表面活性剂及聚乙二醇4000添加量对Fe-Mn/ZSM-5/CC催化剂的涂覆率及NOx催化还原性能的影响.结果显示,表面活性剂的种类和添加量对整体式催化剂的涂覆效果和催化活性均有明显的影响,当聚乙二醇4000加入量为15%时,浆料的涂覆率和稳定性均最好,所制备的整体式催化剂在160~430℃范围内NOx转化率达到了95%以上.同时采用XRD、N2-吸附脱附、扫描电镜等技术对整体式催化剂涂层均匀性、微孔结构和表面形貌进行了分析.结果表明,在堇青石表面所形成的涂层均匀性和覆盖度与整体式催化剂的SCR催化活性有直接的关系,同时,较多的微孔结构也有利于催化剂活性的提高.
Fe-Mn /ZSM-5 slurries were added with different surfactants such as PVA,PEG4000 and CMC,and coated on cordierite honeycomb carriers to prepare Fe-Mn /ZSM-5 m onolithic catalysts. The effects of different surfactants and additive amount of PEG4000 on the coating efficiency and the SCR performance of Fe-Mn /ZSM-5 monolithic catalysts were investigated. The results indicated that the coating efficiency and the catalytic activities of monolithic catalysts were significantly affected by the types and contents of surfactants. When adding 15%PEG4000,the coating efficiency and the coating stability of slurry reached the best level. The monolithic catalyst also exhibited the best catalytic activity,with NOxconversion of more than 95% in the reaction temperature range of160 ~ 430 ℃. Moreover,the surface morphology,micropore structure and coating uniformity of the honeycomb monolithic catalyst were analyzed by XRD,nitrogen adsorption desorption and SEM techniques. It can be found that the SCR catalytic activity of monolithic catalyst is correlated to the uniformity and coverage of coating layer formed on cordierite surface,and the presence of micropore structure also can improve the activity of the honeycomb monolithic catalysts.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2014年第3期227-233,共7页
Journal of Molecular Catalysis(China)
基金
国家自然科学基金项目(项目编号:21073131)
山西省科技攻关项目(项目编号:20100321023)资助
