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Study on Synthesis and Properties of Perovskite-Type LaCoO3Nanotubes

Author: GaoXiang
Tutor: MaZhi; YuQingEn
School: Tianjin University
Course: Chemical Engineering
Keywords: LaCoO3 perovskite nanotubes hard template method activeoxygen
CLC: O614.331
Type: Master's thesis
Year: 2012
Downloads: 59
Quote: 0
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Abstract


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.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section III group metal elements and their compounds > Lanthanides ( rare earth elements ) > Lanthanum La
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