载体对La_(0.8)Sr_(0.2)CoO_3燃烧催化剂性能的影响  

Effects of Support on the Performance of Combustion Catalyst La_(0.8)Sr_(0.2)CoO_3

作　　者：薛屏[1] 蔡超[1] 

机构地区：[1]宁夏大学化学科学与工程系,宁夏银川750021

出　　处：《稀土》2002年第6期13-16,共4页Chinese Rare Earths

基　　金：宁夏回族自治区自然科学基金资助项目(B006)

摘　　要：用浸渍法制备负载型La0.8Sr0.2CoO3燃烧催化剂,比较了γ-Al2O3和堇青石(Cordierite,2MgO·2Al2O3·5SiO2)载体的负载效果和这两种催化剂二甲苯完全氧化的催化活性。利用TPR和XPS等手段对两种催化剂的结构性质进行了表征。La08Sr02CoO3 is the most effective perovskite-type oxide catalysts for CO oxidation,HC complete oxidation and NOx reduction in general consideration In the present work ,combustion catalysts La08Sr02CoO3(LSC) supported on γ-Al2O3 and cordierite (2MgO·2Al2O3·5SiO2) were prepared by impregnation methodIt was observed that perovskite-type oxide exists in LSC/cordierite catalyst loaded with 20%(mass fraction) LSC (La08Sr02CoO3 or corresponding oxides) and heated at 850℃ or aboveOn the other hand, at same temperature,no perovskite-type oxide forms in LSC/γ-Al2O3 catalyst XPS results show that the binding energy of Co2p of LSC/γ-Al2O3 is higher that of Co2p of LSC/ cordierite due to the form of CoAl2O4 phase in LSC/γ-Al2O3The investigation of TPR shows that the order of reduction peak temperature (characteristic peak of perovskite-type oxides) is : neat LSC (704℃) >LSC/ cordierite (590℃) > LSC/γ-Al2O3 (554℃)It is correlated with the increasing of the effect of support sequentiallySo the catalytic activity of LSC/γ-Al2O3 for complete oxidation of xylene is lower

关 键 词：载体 燃烧催化剂 LA0.8SR0.2COO3 XPS TPR 二甲苯 氧化 催化性能 稀土 Γ-AL2O3 堇青石 

分 类 号：O643.21[理学—物理化学] O643[理学—化学]