Study On Synthesis And Properties Of Perovskite-Type LaCoO₃Nanotubes

Different methods are investigated for the synthesis of perovskite-type LaCoO₃nanotubes, including its appearance, phase structures and properties. Severalconclusions are obtained as follows:We could obtained perovskite-type LaCoO₃nanotubes by the hard template method,and obtained La（OH）₃nanotubes by the hydrothermal synthesis method;The pore size of the templates and the particle diameter are the crucial factor for thesynthesis progress of LaCoO₃nanotubes;The electric resistance of the LaCoO₃nanotubes would grow down slightly fasterthan the LaCoO₃particles as the temperature increased, even decreased to100at300℃, thus the electric conductivity of the LaCoO₃nanotubes is better than that ofLaCoO₃particles. In the reaction of NO catalytic reduction, the LaCoO₃nanotubesexhibit better catalytic activity than the LaCoO₃particles. The NO conversion rate ofit could increase to45%at580℃,2%higher than that of LaCoO₃particles, with theCO2outlet concentration is0.005%more simultaneously.We infer that the reason for the better performance of the LaCoO₃nanotubes isattributed as its more active oxygen than LaCoO₃particles.In the process of the preparation of AAO, the pretreatment and the lowertemperature could make the AAO batter, while reducing the distance of electric polecould get larger pore size.