金属载体催化剂的涂层研究

Washcoat Study of Metallic Substrate

在高温氧化处理不同时间的金属载体箔片上涂覆MgAl2O4/Al2O3过渡涂层,利用TG—DSC,XRD,SEM,BET和超声振动等分析测试技术,对载体和涂层的微观结构与表面特性进行研究。结果表明,在950℃下高温氧化5 h。箔片表面生成板状Al2O3晶须,有利于增强涂层与箔片的附着力。在载体表面涂覆一层MgAl2O4/Al2O3过渡涂层,有助于提高活性组分与金属载体的结合力,可以获得高结合强度的涂层结构,促使活性元素高度分散。

Metallic foil is oxidized at high temperature for different time before being coated with MgAl2O4/ Al2O3 in-between washcoat. The microstructure and surface character were researched by TG-DSC, XRD, SEM and ultrasonic vibration etc. Tabulate Al2O3 crystal was formed on the surface of the metallic foil after being oxidized at 950 ℃ for 5 h, which made the adhesion between washcoat and foil stronger. Coating MgAl2O4/Al2O3 in-between washcoat helps to increase coherence between active component and metallic substrate, get strong coherence washcoat structure and made active elements dispersing well.