无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2025, Vol. 57 ›› Issue (6): 77-84.doi: 10.19964/j.issn.1006-4990.2024-0313

• 研究与开发 • 上一篇    下一篇

网状框架超细氧化铈的热分解行为研究

孟龙辉1,2,3(), 胡艳宏1,2,3(), 杨国胜4, 赵延4, 张晓伟2,3, 柳召刚2,3, 王瑞芬3   

  1. 1.内蒙古科技大学材料科学与工程学院,内蒙古 包头 014000
    2.内蒙古自治区稀土湿法冶金与轻稀土应用;重点实验室,内蒙古 包头 014000
    3.轻稀土资源绿色提取与高效利用教育部重点实验室,内蒙古 包头 014000
    4.包头天骄清美稀土抛光粉有限公司,内蒙古 包头 014030
  • 收稿日期:2024-06-06 出版日期:2025-06-10 发布日期:2025-06-25
  • 通讯作者: 胡艳宏,教授,硕士生导师,研究方向为无机粉体材料的制备和合成机理及轻稀土应用;E-mail:bthyh@163.com
  • 作者简介:孟龙辉(2000— ),男,硕士研究生,研究方向为超细铈基化合物的制备;E-mail:774505582@qq.com
  • 基金资助:
    国家自然科学基金项目(21666029);北方稀土项目(BFXT-2022-D-0053);草原英才个人培养项目;内蒙古自治区直属高校基本科研业务费项目

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

MENG Longhui1,2,3(), HU Yanhong1,2,3(), YANG Guosheng4, ZHAO Yan4, ZHANG Xiaowei2,3, LIU Zhaogang2,3, WANG Ruifen3   

  1. 1. School of Materials Science and Engineering,Inner Mongolia University of Science and Technology,Baotou 014000,China
    2. Key Laboratory of Rare Earth Hydrometallurgy and Light Rare Earth Applications,Inner Mongolia Autonomous Region,Baotou 014000,China
    3. Key Laboratory of Green Extraction and Efficient Utilization of Light Rare Earth Resources,Ministry of Education,Baotou 014000,China
    4. Baotou Tian-jiao Seimi RE Polishing Powder Co. ,Ltd. ,Baotou 014030,China
  • Received:2024-06-06 Published:2025-06-10 Online:2025-06-25

摘要:

针对超细氧化铈前驱体焙烧过程中所产生的团聚和烧结问题,提出了一种利用多功能网状框架聚乙二醇(PEG)制备超细氧化铈粉体的前驱体碳酸铈盐的新思路,采用TG-DSC热分析仪研究前驱体的热分解过程并进行动力学分析,考察了焙烧温度、升温速率、保温时间对超细氧化铈粒径、形貌及晶体结构的影响。实验结果表明:前驱体的热分解过程分为3个阶段:第一阶段温度为25~258 ℃时,为脱自由水阶段,质量损失率为2.94%;第二阶段温度为258~422 ℃时,质量损失率为11.86%,前驱体Ce(CO32O·H2O、Ce2(CO32O·H2O分解为CeCO3OH和CeO2;第三阶段温度为422~630 ℃时,残留的PEG高温氧化分解挥发,部分稀土碳酸铈盐CeCO3OH分解生成晶型完美的氧化铈,质量损失率为10.29%。运用Freeman-Carroll法计算确定第二阶段反应活化能(E)为166.68 kJ/mol,反应级数(n)为19.27;第三阶段反应活化能(E)为101.95 kJ/mol,反应级数(n)为14.75。确定在焙烧温度为1 000 ℃,升温速率为300 ℃/h,保温时间为3 h的焙烧制度下,可得到中值粒径D50≤0.50 µm的超细氧化铈粉体。

关键词: 网状框架, 超细氧化铈, 焙烧, 动力学分析, 反应活化能

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(CO32O·H2O and Ce2(CO32O·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

中图分类号: