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

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.

Preparation and Catalytic Performances of Perovskite Oxides LaBO3 with Different Morphologies for H2O2 Decomposition

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 H₂O₂ 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 H₂O₂ 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).