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钙钛矿型复合氧化物(ABO_3)具有明确的结构和较高的热稳定性,通过A,B位元素取代可以改变离子的氧化态,控制氧缺陷数目等,常用作研究固态化学性质和催化性能关系的材料.LaFeO_3及其掺杂体系用于CH_4,CO和CH_3CH_2CH_3完全氧化已有文献报道,但采用固态化学方法制备的这些复合氧化物由于比表面小,使活性的提高受到限制,考虑到纳米尺寸的氧化物具有较高的比表面和某些独特的物理化学性质,有可能降低完全氧化的反应温度,获得高活性的催化材料,我们首次制备了纳米尺寸的A位掺Sr和B位掺Mn的LaFeO_3系
The perovskite-type composite oxide (ABO_3) has a well-defined structure and high thermal stability. The substitution of A and B elements can change the oxidation state of the ions and control the number of oxygen defects, and is often used for the study of solid-state chemistry and catalysis However, the complete oxidation of LaFeO_3 and its doped systems for CH_4, CO and CH_3CH_2CH_3 has been reported in the literature. Nano-sized oxides have higher specific surface area and some unique physicochemical properties, and it is possible to reduce the reaction temperature for complete oxidation to obtain highly active catalytic materials. For the first time, nanosized A-sites doped with Sr and B Mn-doped LaFeO_3 system