十水草酸铈的热分解过程以及热分解动力学研究

摘要利用TG-DSC法研究了十水草酸铈在N₂和O₂氛围下煅烧过程的差异及其分解动力学机理。结果表明，十水草酸铈在N₂气氛下煅烧时，煅烧产物CeO₂表面附着有黑色的炭黑，而在O₂气氛下煅烧时，仅得到浅黄色的CeO₂。依据实验结果推测，十水草酸铈在N₂气氛下煅烧时经历3步热分解过程；而在O₂气氛下煅烧时经历2步分解过程，第1步为十水草酸铈脱去十分子结晶水生成无水草酸铈，第2步为无水草酸铈氧化分解为CeO₂。最后，对十水草酸铈在O₂气氛下煅烧时的2步热分解动力学机理进行了研究。结果表明，第1阶段脱水过程的活化能在53.50~65.63 kJ·mol^-1之间，第2段氧化分解过程的活化能约为156.52 kJ·mol^-1。十水草酸铈热分解过程以及热分解动力学的探究能够为其后续煅烧制备CeO₂提供重要的热力学数据。

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	苑斯雯
	杨金月
	周冠辰
	谢非
	黄云海
	田贝倩
	吴德慧
	侯学锋
	黄欣
	郝红勋

关键词：十水草酸铈 TG-DSC 热分解过程热分解动力学

Abstract： The differences of thermal decomposition of cerium oxalate decahydrate under N₂ and O₂ atmosphere were investigated and compared by performing TG-DSC in this work. The results indicated that under N₂ atmosphere, black elemental carbon would deposit on the surface of CeO₂. While under O₂ atmosphere, the calcined product was pale yellow, which was the color of CeO₂. The thermal decomposition process of cerium oxalate decahydrate under N₂ would go through three stages. Two processes would occur under O₂ atmosphere, the first process is the dehydration of cerium oxalate decahyrate; the second process is the decomposition of anhydrous cerium oxalate. The thermal decomposition mechanisms of cerium oxalate decahyrate under O₂ atmosphere were also studied. The activation energy for the first stage (dehydration process) was between 53.50 and 65.63 kJ·mol^-1, and the activation energy for the second stage was 156.52 kJ·mol^-1. The research on the thermal decomposition process and kinetics of cerium oxalate dehydrate could provide a crucial theoretical basis for the preparation of CeO₂.

Keywords： cerium oxalate decahydrate； TG-DSC； thermal decomposition process； thermal decomposition kinetics

Received 2020-10-10;

Fund:天津市自然科学基金（18JCYBJC40800）。

Corresponding Authors: 黄欣,E-mail:x_huang@tju.edu.cn;郝红勋,E-mail:hongxunhao@tju.edu.cn。 Email: x_huang@tju.edu.cn;hongxunhao@tju.edu.cn

About author: 苑斯雯(1989-),女,工程师,现从事药物结晶与功能晶体材料方面的研究。

引用本文:

苑斯雯, 杨金月, 周冠辰, 谢非, 黄云海, 田贝倩, 吴德慧, 侯学锋, 黄欣, 郝红勋.十水草酸铈的热分解过程以及热分解动力学研究[J]. 化学工业与工程, 2021,38(4): 1-12

Yuan Siwen, Yang Jinyue, Zhou Guanchen, Xie Fei, Huang Yunhai, Tian Beiqian, Wu Dehui, Hou Xuefeng, Huang Xin, Hao Hongxun.Thermal Decomposition Process and Kinetics of Cerium Oxalate Decahydrate[J]. Chemcial Industry and Engineering, 2021,38(4): 1-12

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