超细钙钛矿复合氧化物的制备和性能研究

Preparation and Properties of Ultra Fine LaMnO_3 and LaCoO_3 Perovskite Compounds

钙钛矿型复合氧化物(ABO3)具有稳定的结构和较好的热稳定性,是一类被视为能够替代传统贵金属控制汽车尾气净化催化剂的新型三效催化剂.

In this paper, three different methods, such as amorphous-complexometry, co-precipitation, and sol-gel have been used for preparation of LaMnO3 and LaCoO3 perovskite compounds. The particle size, disperse and reductive capability were characterized by XRD, TEM, TPR technologies. The results showed that all the LaMnO3 and LaCoO3 perovskite compounds are nano-sized. Comparing the two seizes of LaMnO3 and LaCoO3 perovskite compounds, the sample prepared by sol-gel method showed good catalytic activity and in good distribution condition in LaMnO3 series, and the sample prepared by amorphous-complexometry method shows the best properties in LaCoO3 series.