Effect of preparation method on physicochemical properties and catalytic performances of LaCoO3 perovskite for CO oxidation  

作　　者：Shan Wang Xuelian Xu Junjiang Zhu Duihai Tang Zhen Zhao 

机构地区：[1]Institute of Catalysis for Energy and Environment,College of Chemistry and Chemical Engineering,Shenyang Normal University, Shenyang 110034,China [2]College of Chemistry and Chemical Engineering,Wuhan Textile University,Wuhan 430200,China [3]Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing,Wuhan Textile University,Wuhan 430200,China

出　　处：《Journal of Rare Earths》2019年第9期970-977,I0003,共9页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(21203254);Natural Science Foundation of Hubei Province(2015CFA138);Natural Science Foundation of Liaoning Province(201602681);Shenyang Municipal Science and Technology Planning Projects(17-76-1-00)

摘　　要：Perovskite oxides LaCoO3 prepared by templating,co-precipitation and sol-gel method with different complexants were systematically characterized and its catalytic performances for CO oxidation were investigated.The samples were characterized by X-ray diffraction,thermogravimetry analysis and differential scanning calorimetry,N2 physisorption,transmission electron microscopy,temperature program reduction of hydrogen,temperature program desorption of oxygen and X-ray photoelectron spectroscopy measurement,results of which show that the properties of LaCoO3,such as surface morphology,surface area,surface compositions,redox capability,oxygen vacancy,as well as the calcination temperature and formation mechanism,depend intimately on the preparation method.Catalytic tests indicate that the sample prepared by carbon templating method shows the best activity for CO oxidation,with full CO conversion obtained at 135℃.In particular,the catalyst can be activated and significant increase of activity can be obtained with the increase of reaction time.The cyclic and longterm stability of catalysts were discussed and compared.Perovskite oxides LaCoO3 prepared by templating, co-precipitation and sol-gel method with different complexants were systematically characterized and its catalytic performances for CO oxidation were investigated. The samples were characterized by X-ray diffraction, thermogravimetry analysis and differential scanning calorimetry, N2 physisorption, transmission electron microscopy, temperature program reduction of hydrogen, temperature program desorption of oxygen and X-ray photoelectron spectroscopy measurement, results of which show that the properties of LaCoO3, such as surface morphology, surface area, surface compositions, redox capability, oxygen vacancy, as well as the calcination temperature and formation mechanism, depend intimately on the preparation method. Catalytic tests indicate that the sample prepared by carbon templating method shows the best activity for CO oxidation, with full CO conversion obtained at 135 ℃. In particular, the catalyst can be activated and significant increase of activity can be obtained with the increase of reaction time. The cyclic and longterm stability of catalysts were discussed and compared.

关 键 词：PEROVSKITE OXIDES IaCoO3 Preparation method PHYSICOCHEMICAL properties CO oxidation RARE earths 

分 类 号：TF[冶金工程]