稀土掺杂对LaSrCoO_4催化剂性能的影响

Effects of Rare Earth on the Catalytic Property of LaSrCoO_4

采用聚丙烯胺溶胶-凝胶法制备了类钙钛矿La0.7Nd0.3SrCoO4和La0.7Ce0.3SrCoO4复合氧化物催化剂,考察了它们对CO和C3H8的催化氧化活性,并运用XRD,IR,TPR和TPD等手段对催化剂进行了表征。结果表明,稀土掺杂后的LaSrCoO4复合氧化物均为K2NiF4型结构,不同稀土掺杂对LaSrCoO4复合氧化物的CO和C3H8氧化活性的影响不同,Nd掺杂能增加Co3+、化学吸附氧和晶格氧的数量,提高复合氧化物的活性。

Perovskite-like La0. 7Nd0.3SrCoO4 and La0.7Ce0.3SrCoO4 mixed oxides were prepared by the polyacrylamid sol- gel method and their catalytic activities were studied with CO and C3H8 oxidations as a testing reaction. The samples were investigated by XRD,IR,TPR and TPD methods. The results show that these mixed oxides have the structure of K2NiF4 ,the catalyeic activity can be influenced by adulteration of different thulium. The addition of Nd can increase the catalytic activity of LaSrCoO4 for CO and C3Hs oxidation,It can be explained in terms of more content of Co^3＋ ,more mobile lattice oxygen,and more chemisorbed oxygen of La0.7Nd0.3SrCoO4.