金属蜂窝载体表面负载活性氧化铝涂层的研究  

Study on loading of γ-alumina washcoat on FeCrAl metallic honeycomb support

作　　者：朱小勇[1] 郭耘[1] 郭杨龙[1] 卢冠忠[1] 张志刚[1] 

机构地区：[1]华东理工大学工业催化研究所结构可控先进功能材料及其制备教育部重点实验室,上海200237

出　　处：《工业催化》2008年第8期8-13,共6页Industrial Catalysis

基　　金：国家重点基础研究发展计划(973计划)(2004CB719500);上海市纳米科技专项基金资助项目(0452nm005)

摘　　要：采用高温氧化法对合金FeCrA l金属基体进行预处理,使用A lOOH胶浸渍活性涂层,考察了氧化温度、氧化时间、料浆配方、制备条件以及焙烧温度等因素对涂层的影响。利用XRD、SEM、BET和超声波振动等方法研究了样品的表观性能和涂层的结合性能。结果表明,950℃氧化10 h的氧化处理可以在金属基体上形成粗糙的表层,增加涂层粘结能力。在料浆的制备过程中,加入添加剂以及提高活性涂层的焙烧温度都可以明显提高涂层与金属载体的结合力,得到的涂层牢固,比表面积达212 m2.g-1,满足工业应用要求。Alumina washcoat on metallic honeycomb support was prepared using pseudoboehmite, HNO3, and other additives after high temperature oxidation pretreatment. The microstructure and surface properties of the washcoat/metallic honeycomb were investigated by XRD, SEM, BET and ultrasonic vibration. The results showed that rough layers formed on metal foil surface during pre-oxidation at 950℃ for 10 h, which exhibited excellent compatibility with γ-alumina-based washcoat. Properties of the washcoat were affected by properties of the slurry gel, such as types of the surfactants, viscosity, solid content, particle size and particle size distribution. The washcoat, with BET surface area of 212m^2·g^-1, had excellent resistance to attrition and met the requirement of commercial application.

关 键 词：催化化学 金属蜂窝载体 氧化铝涂层 高温氧化 表面预处理 

分 类 号：TQ426.65[化学工程] O643.36[理学—物理化学]