低温CO氧化中担载Co_3O_4催化剂失活的影响因素(英文)

作     者：Moon Hyeon KIM Dong Woo KIM 

作者机构：Department of Environmental EngineeringDaegu University 

出 版 物：《催化学报》 (CHINESE JOURNAL OF CATALYSIS)

年 卷 期：2011年第32卷第5期

页      面：762-770页

核心收录：

学科分类：081705[工学-工业催化] 0817[工学-化学工程与技术] 08[工学] 0703[理学-化学] 

基　　金：supported by the University Research Grant 

主　　题：carbon monoxide oxidation supported cobalt oxides deactivation reaction parameters feed compositions 

摘      要：This study focused on the influences of a variety of reaction parameters and guest molecules such as H2O and C3H8 on the deactivation of supported Co3O4 catalysts for CO ***,the physical features of and carbon deposition on some samples after the reaction under the chosen conditions were determined by BET and X-ray diffraction as well as by carbon analyses to deduce the precursors associated with catalyst *** maintenance profiles of the catalysts for CO oxidation at 100°C significantly depended on the support for Co3O4 nanoparticle dispersion,the loading,the preparation technique and the calcination *** best on-stream performance was achieved using a 5%Co3O4/TiO2 catalyst prepared by the incipient wetness method followed by calcination at 350°*** the reaction parameters chosen here such as the reaction temperature,the feed gas composition of CO,O2,H2O,and C3H8,and the gas space velocity strongly influenced the extent of catalyst deactivation during CO oxidation and also the rate of catalyst ***,the deactivation behavior is very *** appreciable changes in the surface area,the porosity,and the phase of the Co3O4 nanoparticles and their size occurred even for the samples that were severely *** deposition of carbon on the catalysts after the reaction was visible and it depended on the reaction parameters chosen ***,this extensive parametric study on the deactivation of catalysts during oxidation and with the chosen reaction parameters and guest gases can lead to an understanding of the deactivation precursors that are associated with carbonaceous species including carbonates and surface free carbon.