文献类型：期刊文献

中文题名：二水合醋酸锌热分解机理与动力学

英文题名：Mechanism and Kinetics of Thermal Decomposition of Dihydrate Zinc Acetate

作者：赵新宇[1];李春忠[1];郑柏存[1];古宏晨[1];胡黎明[1]

机构：[1]华东理工大学技术化学物理研究所

年份：1997

卷号：23

期号：2

起止页码：191

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;EI(收录号：1997123978778);Scopus;北大核心:【北大核心1996】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金

语种：中文

中文关键词：热分解;动力学;喷雾热解;二水合醋酸锌

外文关键词：ZnO;thermal decomposition;mechanism;kinetics;spray pyrolysis;ultrafine particle

摘要：采用热重（ＴＧ）和差热（ＤＴＡ）等热分析手段研究了Ｚｎ（ＣＨ３ＣＯＯ）２·２Ｈ２Ｏ热分解过程。结果表明，Ｚｎ（ＣＨ３ＣＯＯ）２·２Ｈ２Ｏ在２００°Ｃ以下脱去两分子结晶水，形成的Ｚｎ（ＣＨ３ＣＯＯ）２在２４２°Ｃ熔融，３７０°Ｃ完全分解为ＺｎＯ。脱水和分解过程失重分别为１７．１％和４６．７％，与理论值相符。Ｚｎ（ＣＨ３ＣＯＯ）２热分解反应机理符合随机核化机理，并得到了相应的机理模型。经验证该机理模型与实验结果相符。采用喷雾热解方法，以Ｚｎ（ＣＨ３ＣＯＯ）２·２Ｈ２Ｏ为前驱体制得了２０～３０ｎｍ粒度均匀的六方晶系ＺｎＯ纳米粉末。
The thermal decomposition process of zinc acetate dihydrate was studied by differential thermal analysis(DTA) and thermalgravimetric analysis(TG).It was shown that the water of crystallization was dehydrated and anhydrous zinc acetate was formed at below 200°C.Anhydrous zinc acetate melted at 242°C,and decomposed into ZnO at about 370°C. The weight losses of dehydration and decomposition were 16.7% and 46.7%,respectively,which conformed with theoretical values.The mechanism of decomposition of anhydrous zinc acetate was inferred as random nucleation mechanism(Aurami equation II).Accordingly,a mechanism model was deduced,and verified by experiment results.Phase pure ZnO ultrrafine powder with uniform size of 20～30nm was synthesized by spray pyrolysis from zinc acetate dihydrate.