Dehydration Kinetics of Zinc Phosphate Tetrahydrate α‐Zn3(PO4)2·4H2O Nanoparticle
Dehydration Kinetics of Zinc Phosphate Tetrahydrate α‐Zn3(PO4)2·4H2O Nanoparticle
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DOI：
10.1002/cjoc.200790157
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发表时间：
2007-06
影响因子：
5.4
通讯作者：
A. Yuan;Jian Wu;Zaiyin Huang;Zeguang Zhou;Yanxuan Wen;Z. Tong
中科院分区：
文献类型：
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作者：
A. Yuan;Jian Wu;Zaiyin Huang;Zeguang Zhou;Yanxuan Wen;Z. Tong
采用TG-DTG技术和Harcourt-Esson积分方程研究了四水磷酸锌纳米粒子α-Zn 3（PO 4）2·4 H2O的脱水过程及其热分解动力学。结果表明，在300 ~ 800 K温度范围内，α-Zn 3（PO 4）2·4 H2O纳米粒子的热分解过程分为3个脱水阶段。第一阶段由化学反应控制，活化能为69.48 kJ·mol−1，指前因子为1.77×106 s−1。第二个过程由成核和生长控制，活化能为78.74 kJ·mol-1，指前因子为5.86×109 s-1。第三个过程由成核和生长控制，活化能为141.5 kJ·mol-1，指前因子为1.01×1012 s-1。动力学补偿效应不仅存在于Arcourius方程中，也存在于Harcour-Esson方程中。活化能E取决于分解分数α和温度T。
TG-DTG technique and Harcourt-Esson integrated equation were used to study the dehydration process of zinc phosphate tetrahydrate α-Zn3(PO4)2·4H2O nanoparticle and its thermal decomposition kinetics. The results show that there are three stages of dehydration between 300 and 800 K during the thermal decomposition of α-Zn3(PO4)2·4H2O nanoparticle. The first stage is controlled by chemical reaction with an activation energy of 69.48 kJ·mol−1 and a pre-exponential factor of 1.77×106 s−1. The second is controlled by nucleation and growth with an activation energy of 78.74 kJ·mol−1 and a pre-exponential factor of 5.86×109 s−1. The third is controlled by nucleation and growth with an activation energy of 141.5 kJ·mol−1 and a pre-exponential factor of 1.01×1012 s−1. The kinetic compensative effects not only exist in Arrhenius equation but also in Harcourt-Esson equation. Activation energy E is dependent on both the decomposition fraction α and temperature T.