物理化学学报2011，Vol.27Issue(5)：1169-1175,7.
La2CoAlO6催化剂的制备及其甲烷催化燃烧性能
Preparation and Catalytic Activities of La2CoAl06 for Methane Combustion
摘要
Abstract
A novel rare earth double perovskite-type catalyst (La2CoAlO6) was prepared by the sol-gel method using citric acid as complex agent.The catalyst was characterized by X-ray powder diffraction (XRD), H2-temperature-programmed reduction (H2-TPR), specific surface area (BET), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and magnetic property measurement.This catalyst was evaluated for methane combustion.The results showed that a single-phase rare earth double perovskite oxide La2CoAlO6 could be formed by calcination at 1100 ℃ for 3 h.La2CoAlO6 gives good catalytic activity for methane combustion.It has a light-off temperature (T10) of 434.1 ℃ and a total conversion temperature (T90) of 657.4 ℃.Compared with the single rare earth perovskite-type oxides LaCoO3 and LaAlO3, the T10 decreased by 56.5 and 138.2 ℃, and T90 decreased by 84.6 and 108.9 ℃,respectively.The FT-IR results indicate that all the synthesized oxides possess perovskite-type structures.Furthermore, the La2CoAlO6 samples showed excellent catalytic activity for methane combustion, which could be related to the decrease in reduction temperature that was observed in the H2-TPR experiments.This was probably because of the increased oxygen mobility that was promoted by the presence of aluminum.In addition, the rare earth double perovskite-type oxide La2CoAlO6 has a platelet morphology and is resistant to sintering.We also found that the double perovskite oxide La2CoAlO6 had special magnetic properties.关键词
稀土/双钙钛矿/单钙钛矿/甲烷催化燃烧/溶胶-凝胶法Key words
Rare earth/ Double perovskite/ Single perovskite/ Methane catalytic combustion/ Sol-gel method分类
化学化工引用本文复制引用
张慧敏,胡瑞生,胡佳楠,张玉龙..La2CoAlO6催化剂的制备及其甲烷催化燃烧性能[J].物理化学学报,2011,27(5):1169-1175,7.基金项目
国家自然科学基金(20763003),教育部春晖计划(Z2007-1-01029)及内蒙古自然科学基金(2008 0404 MS 0123)资助项目 （20763003）
