ABO_2型复合氧化物上CO-NO的反应性能  

CO- NO Reaction over ABO2 Complex Oxides with Dalofossite Structure

作　　者：赵峰[1] 刘英骏[1] 李能[1] 林炳雄[1] 

机构地区：[1]北京大学物理化学研究所,北京100871

出　　处：《物理化学学报》2001年第6期511-515,共5页Acta Physico-Chimica Sinica

摘　　要：以柠檬酸络合法制备了 CuCrO_2、 CuAlO_2和 CuFeO2等具有铜铁矿结构的 ABO2型复合氧化物，并考察了它们在氧化和还原气氛中对 CO- NO反应的影响 . CuAlO_2和 CuCrO_2具有好的催化活性， CuCrO_2更具有相当的稳定性，经过氧化和还原条件下的 CO- NO反应后，体相组成仍然保持不变 . CuAlO_2在还原条件下，部分被还原生成了零价铜 . CuFeO_2的催化活性和稳定性较差，在还原气氛中催化 CO- NO反应过程中，样品被还原，完全转化成了 Cu0和 CuFe2O4.ABO(2)(A = Cu; B = Cr, Al, Fe) complex oxides have been prepared by amorphous citrate precursors method. Formation of single-phase dalofossite structure was confirmed by XRD examination. A conventional fixed-bed micro-reaction technique was used in measuring the catalytic activities of these complex oxides for GO-NO reaction under both oxidizing and reducing conditions. CuAlO2 and CuCrO2 show good catalytic activity towards GO-NO reaction. CuCrO2 was quite stable and no changes in the bulk phase composition were detected even after long time GO-NO reaction under both oxidizing and reducing conditions. CuAlO2, which was stable enough under oxidizing conditions, was partly reduced to Cu-0 after long time catalytic reaction under reducing conditions. Although no phase composition changes were detected in CuFeO2 bulk phase after long time catalytic test under oxidizing conditions, partial reduction on the surface can be expected. After catalytic test under reducing conditions, CuFeO2 totally converted to Cu-0 and CuFe2O4. Compared with those catalysts of perovskite structure, ABO(2) samples show much better catalytic activity for GO-NO reaction.

关 键 词：一氧化碳 一氧化氮 DeNOx催化剂 铜矿铁型复合氧化物 废气治理 催化性能 

分 类 号：O643.3[理学—物理化学]