Kinetics of thermal decomposition of CeO2 nanocrystalline precursor prepared by precipitation method

• 来源期刊: 中国高等学校学术文摘·化学
• 关键词: CeO2 nanocrystals thermal decomposition kinetics thermo-gravimetric/differential scanning calorimetry (TG/DSC)
• 年，卷（期）: 2008,（2）
• 页码范围: 182-185
• 页数: 4页
• 语种: 英文

摘要

The thermal decomposition of CeO2 nanocrystalline precursor prepared by chemical precipitation method was investigated using thermo-gravimetric/differential scanning calorimetry (TG/DSC) and X-ray powder diffraction (XRD).In particular,the differential thermal analysis curves for the decomposition of CeO2 nanocrystalline precursor were measured at different heating rates in air by a thermal analyzer (NETZSCH STA 449C,Germany).The kinetic parameters of the thermal decomposition of CeO2 nanocrystalline precursor were calculated using the Kissinger method and the Coats-Redfern method.Results show that the apparent active energy E of the reaction is 105.51 kJ/mol,the frequency factor lnA is 3.602 and the reaction order n is 2.This thermal decomposition process can be described by the anti-Jander equation and a threedimensional diffusion mechanism.