Effect of intermediate layer on the activity and adhesion stability of metal monolith supported LaMn-hexaaluminate catalyst for methane combustion  

作　　者：张立红 李彤 张敏敏 李永丹 

机构地区：[1]Department of Catalysis Science and Technology and Tianjin Key Laboratory of Applied Catalysis Science & Technology, School of Chemical Engineering, Tianjin University

出　　处：《Journal of Rare Earths》2011年第8期758-762,共5页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (20901056);the Natural Science Foundation of Tianjin (11JCYBJC04000);the Program of Introducing Talents to the University Disciplines (B06006);the Program for Changjiang Scholars and Innovative Research Teams in Universities (IRT 0641);Seed Foundation of Tianjin University

摘　　要：Al2O3 and La2O3 layers were coated respectively on a FeCrAl alloy foil by a dip-coating technique and used as the second support for the active LaMnAl11O19 hexaaluminate （HA） phase in a metallic monolithic catalyst. A sample without an intermediate layer was employed for comparison. The properties and performances of the catalyst were examined with X-ray diffraction （XRD）, scanning electron microscopy （SEM）, ultrasonic vibration and thermal shock techniques. Methane catalytic combustion was performed to evaluate the activity of the catalyst. The results showed that the activity and adhesion of the HA to the alloy foil could be improved with the introduction of the intermediate layer. Al2O3 provided a strong adhesion, while La2O3 weakened the interaction between the active component and alloy foil. For the activity, the catalysts made with the two different intermediate materials also showed difference.Al2O3 and La2O3 layers were coated respectively on a FeCrAl alloy foil by a dip-coating technique and used as the second support for the active LaMnAl11O19 hexaaluminate （HA） phase in a metallic monolithic catalyst. A sample without an intermediate layer was employed for comparison. The properties and performances of the catalyst were examined with X-ray diffraction （XRD）, scanning electron microscopy （SEM）, ultrasonic vibration and thermal shock techniques. Methane catalytic combustion was performed to evaluate the activity of the catalyst. The results showed that the activity and adhesion of the HA to the alloy foil could be improved with the introduction of the intermediate layer. Al2O3 provided a strong adhesion, while La2O3 weakened the interaction between the active component and alloy foil. For the activity, the catalysts made with the two different intermediate materials also showed difference.

关 键 词：monolithic combustion catalyst FeCrAlloy HEXAALUMINATE intermediate layer adhesion stability rare earths 

分 类 号：O643.32[理学—物理化学]