网状框架超细氧化铈的热分解行为研究

doi:10.19964/j.issn.1006-4990.2024-0313

Abstract

Abstract:

Aiming at the agglomeration and sintering problems generated during the roasting process of ultrafine cerium oxide precursor，a new idea of using multifunctional reticulated framework polyethylene glycol（PEG） to prepare the precursor cerium carbonate salts of ultrafine cerium oxide powder was proposed，and the thermal decomposition process and kinetic analysis of the precursor were studied by using the TG-DSC thermal analyser and the effect of the roasting temperature，the rate of heating and the holding time on the particle size，morphology and crystal structure of the ultrafine cerium oxide were investigated.The effects of temperature，morphology and crystal structure were investigated.The experimental results showed that the thermal decomposition of the precursor was divided into three stages.The first stage at 25~258 ℃ was the stage of demineralised water，with a weight loss of 2.94%.The second stage was at 258~422 ℃ with a weight loss of 11.86%，and the precursors Ce（CO₃）₂O·H₂O and Ce₂（CO₃）₂O·H₂O were decomposed into CeCO₃OH and CeO₂.The third stage was at 422~630 ℃，the residual PEG was volatilised by high temperature oxidative decomposition，and part of the rare earth cerium carbonate salt CeCO₃OH was decomposed to produce perfectly crystalline cerium oxide with a weight loss of 10.29%.Using the Freeman-Carroll method，the activation energy（E） of the second reaction stage was determined to be 166.68 kJ/mol，and the number of reaction stages（n） was 19.27.The activation energy（E） of the third reaction stage was determined to be 101.95 kJ/mol，and the number of reaction stages（n） was 14.75.It was found that under the roasting system with a roasting temperature of 1 000 ℃，a temperature rise rate of 300 ℃/h and a holding time of 3 h，the mean particle size D₅₀≤0.50 µm of the ultrafine ceria powder could be obtained.

Key words: reticular frame, ultrafine cerium oxide, roast, kinetic analysis, reaction activation energy

CLC Number:

TQ133.3

MENG Longhui, HU Yanhong, YANG Guosheng, ZHAO Yan, ZHANG Xiaowei, LIU Zhaogang, WANG Ruifen. Study on thermal decomposition behaviour of ultrafine cerium oxide with reticulated framework[J]. Inorganic Chemicals Industry, 2025, 57(6): 77-84.

Figures/Tables 11

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Study on thermal decomposition behaviour of ultrafine cerium oxide with reticulated framework

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