钙钛矿型La1-xCexMnO3对CH4、CO和H2的催化燃烧  

CATALYTIC COMBUSTION OF CH4,CO AND H2 ON La1-xCexMnO3 PEROVSKITES

作　　者：赵科[1,2] 徐通模[2] 吕清刚[1] 

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]西安交通大学能动学院,陕西西安710049

出　　处：《工程热物理学报》2010年第6期1049-1052,共4页Journal of Engineering Thermophysics

基　　金：国家重点基础研究资助项目(No.2005CB221206);国家自然科学基金资助项目(No.50906084);中国博士后科学基金(No.20090450578)

摘　　要：用溶胶凝胶法制备了钙钛矿型LaMnO3催化剂，研究了铈替代部分镧对催化材料性能的影响。用XRD、SEM和比表面积等手段对催化剂进行表征，并研究了催化剂对CH4、CO和H2的催化活性。实验结果表明：LaMnO3中掺杂10％的铈，可以增加催化剂的比表面积并保持纯钙钛矿相，还提高了对CH4和CO的催化活性。La0.9Ce0.1MnO3在空速48000h^-1下，T10为417℃，T90为572℃；在CO的催化燃烧中T90为249℃；La0.9Ce0.1MnO3和LaMnO3对H2的催化活性接近，Tgo为260℃。LaMnO3 perovskite catalyst was synthesized by the sol-gel citrate method. The effect of lanthanum substituted by cerium on the physico-chemical characteristics and catalytic activity was analysed. The catalysts were characterized by XRD, SEM and specific surface area （SSA）. The catalytic combustion activity of CH4, CO and H2 was tested. The results show that, adding 10% stoichiometry cerium into LaMnO3 could maintain the perovskite phase, increase the SSA, and have positive effect on the catalytic activity of CH4 and CO. The activity was tested in a fixed bed quartz reactor at gas hourly space velocity （GHSV） of 48000 h 1. The activity of La0.9Ce0.1MnO3 is Tlo at 417℃ and T90 at 572℃. The T90 of La0.9Ce0.1MnO3 is 249℃ in CO oxidation. Concerning the H2 combustion, the similar activity is achieved by the La0.9Ce0.1MnO3 and LaMnO3 with the Tgo of 260℃.

关 键 词：钙钛矿 催化燃烧 CH4 CO H2 

分 类 号：O643[理学—物理化学]