甲烷催化燃烧用LaMn/Al_2O_3催化剂研究  

Study on catalytic combustion of methane over LaMn/Al_2O_3 catalyst

作　　者：胡金燕[1,2] 储伟[1,2] 士丽敏[1] 陈慕华[1] 瞿芬芬[2] 李洋[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]四川大学建筑与环境学院,四川成都610065

出　　处：《化学工程》2009年第8期46-49,共4页Chemical Engineering(China)

基　　金：教育部新世纪人才支持计划资助(NCET-05-0783)

摘　　要：为获得具有优良低温活性的甲烷燃烧用催化剂,采用稀土La作为助剂制备了系列Mn基催化剂,借助X射线衍射(XRD)、X射线光电子能谱(XPS)和程序升温还原(TPR)技术对催化剂的结构进行了表征,并评价了其对甲烷燃烧的低温催化性能。结果表明,La助剂的添加显著促进了活性组分MnO2的分散,使其更易于还原,且使Mn4+和晶格氧富集于催化剂表面,因而显著提高了催化剂对甲烷催化燃烧的低温活性。当La质量分数为5%时,催化活性最高,甲烷50%转化率对应的温度较未加助剂时降低了70℃,且完全转化的温度低至480℃。In order to obtain more active catalysts for low-temperature methane combustion, the novel manganesebased catalysts promoted by lanthanum were prepared. The characteristics of the samples were investigated through X-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS） and temperature-programmed reduction （TPR） techniques. The low-temperature catalytic performances of these samples for methane combustion were studied. The results show that, with the addition of La promoter, the dispersion and reducibility of MnO2 are enhanced remarkably, Mn^4＋ and lattice oxygen are enriched on the catalyst surface. The low-temperature activities are improved significantly by the addition of lanthanum. The catalyst with La mass fraction of 5% exhibits the better activity, over which the temperature responding to 50% methane conversion is decreased by 70℃ than that of the MnO2/Al2O3 catalyst, and the methane conversion reaches 100% at 480℃ over this novel catalyst.

关 键 词：甲烷 催化燃烧 低温活性 锰基催化剂 La助剂 

分 类 号：O643.36[理学—物理化学]