Tribochemistry and kinetics of Al2(SO4)3·xH2O decomposition
Tribochemistry and kinetics of Al2(SO4)3·xH2O decomposition
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DOI：
10.1007/bf02636005
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
Y. Pelovski;V. Petkova
中科院分区：
文献类型：
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作者：
Y. Pelovski;V. Petkova
用TG、DTA和EMF方法研究了摩擦化学活化的Al_2（SO_4）_3x H_2 O的热分解过程。对于一些中间体固体，应用X射线衍射和红外光谱来了解更多关于反应机理的信息。 热分析和电动势研究证实，即使在机械活化Al 2（SO 4）3xH 2 O之后，也会形成Al 2 O（SO 4）2作为中间体。等温动力学实验表明，失活的Al 2（SO 4）3xH 2 O的热化学硫化在850-890 K温度范围内具有102.2 kJmol− 1的活化能。 活化的Al 2（SO 4）3xH 2 O在850-890 K范围内的活化能为55.0 kJmol−1。 当Al_2（SO_4）_3 H_2 O被机械活化时，热分解时间几乎减半。结果允许的结论有关的摩擦化学活化的Al 2（SO 4）3 xH 2 O和脱硫过程的化学和动力学机制的效率。
The thermal decomposition of tribochemically activated Al2(SO4)3xH2O was studied by TG, DTA and EMF methods. For some of the intermediate solids, X-ray diffraction and IR-spectroscopy were applied to learn more about the reaction mechanism. Thermal and EMF studies confirmed that, even after mechanical activation of Al2(SO4)3xH2O, Al2O(SO4)2is formed as an intermediate. Isothermal kinetic experiments demonstrated that the thermochemical sulphurization of inactivated Al2(SO4)3xH2O has an activation energy of 102.2 kJmol−1in the temperature range 850–890 K. The activation energy for activated Al2(SO4)3xH2O in the range 850–890 K is 55.0 kJmol−1. The time of thermal decomposition is almost halved when Al2(SO4)3xH2O is activated mechanically. The results permit conclusions concerning the efficiency of the tribochemical activation of Al2(SO4)3xH2O and the chemical and kinetic mechanisms of the desulphurization process.