不同形貌LaBO_3型钙钛矿的制备及其催化H_2O_2分解反应性能

Preparation and Catalytic Performances of Perovskite Oxides LaBO_3 with Different Morphologies for H_2O_2 Decomposition

采用柠檬酸络合法制备了La BO3(B=Fe,Co,Ni)钙钛矿催化剂,通过X-射线粉末衍射(XRD)、傅立叶-红外光谱(FT-IR)、透射电镜(TEM)、X-射线光电子能谱(XPS)等对催化剂进行了表征,在室温下测定了其对H2O2的催化分解能力.结果表明:催化分解能力依次为La Ni O3>La Co O3>La Fe O3,说明Ni较Co和Fe能更好地分解H2O2.通过改变La Fe O3催化剂的形貌也能提高催化剂性能,如多孔状La Fe O3较负载在SBA-15上的La Fe O3具有更好的催化分解活性.

A series of LaBO3 （ B=Fe, Co, Ni） perovskite catalysts were synthesized by citric acid sol-gel method and characterized by XRD, FT-IR, TEM and XPS.The catalytic performances were tested using H2 O2 decomposition as model reaction.The results indicated that the catalytic activity was in the order of LaNiO3〉LaCoO3 〉LaFeO3 , suggesting that Ni is better than Co and Fe for H2 O2 decomposition.In addition, the catalytic performances can be improved by altering the surface morphology, for example, LaFeO3 fabricated in porous structure showed better catalytic activity than that of LaFeO3 loaded on SBA-15 （LaFeO3/SBA-15）.