铜取代和制备方法对LaMnO_(3±δ)结构和催化甲烷燃烧和CO氧化的影响

• 来源期刊: 催化学报
• 学科: 化学
• 关键词: perovskite Pechini sol-gel methane combustion carbon monoxide oxidation
• 年，卷（期）: 2010,（4）
• 所属期刊栏目: 研究论文
• 页码范围: 394-403
• 分类号: O643
• 字数: 2449字
• 语种: 中文
• DOI: 10.1016/S1872-2067(09)60059-0

摘要

LaMn_(1-x)Cu_xO_(3±δ) perovskite oxides (x = 0, 0.2, 0.4, 0.6, 0.8, 1) were prepared by two different methods, the Pechini and sol-gel methods. The catalysts were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), X-ray fluorescence spectroscopy, N_2 adsorption, and temperature-programmed reduction. Their catalytic activity in the oxidation of methane and CO was evaluated. EDS and SEM results showed that the Pechini samples had more homogeneity and smaller particles (higher specific surface area). The catalytic activity for methane combustion was highest for x = 0.2. In CO oxidation, the oxides with x = 0.2 and x = 0.4 were the most active. The Pechini samples had higher activity and stability than the sol-gel samples.