镧钴镍复合氧化物催化剂的制备及催化甲烷燃烧活性研究

Preparation and Catalytic Activities of LaNi1-xCoxO3 Catalysts For Methane Catalytic Combustion

采用共沉淀法制备LaNi1-xCoxO3系列催化剂(x=0,0.2,0.4,0.6,0.8,1.0),研究B位离子Co的掺杂对钙钛矿LaNiO3催化甲烷燃烧性能的影响。通过X射线衍射、比表面积测定、程序升温还原、扫描电镜、热重分析等对催化剂的结构和性能进行考察。以催化甲烷燃烧为目标,考察了催化剂的性能。研究结果表明,Co离子的掺杂会改变钙钛矿的晶型结构,改善催化活性,当x=0.8时,LaNi0.2Co0.8O3的催化甲烷燃烧活性最高,其比表面积为22.4 m2·g-1,T10%(起燃温度)为475℃,T90%(完全转化温度)为610℃。

A series of LaNi1-xCoxO3(x=0,0.2,0.4,0.6,0.8,1.0)catalysts were prepared by coprecipitation method.The influence of doping of B-site Co ions on LaNiO3 catalyst performance was investigated.The catalyst samples were characterized by XRD,BET,H2-TPR,SEM and TG-DSC techniques.Their catalytic activities were evaluated for methane catalytic combustion.The results showed that the doping of Co ions would result in the change of crystal structure and improvement of the catalytic activity.The catalyst La Ni0.2Co0.8O3 retained a specific surface area of 22.4 m2·g-1 and showed excellent activity for methane combustion.The temperature at conversion of10%and 90%were 475℃and 610℃,respectively.