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采用DSC和TGA及模型拟合Malek法和无模型改进Vyazovkin等转化率法研究机械化学还原Ag2O和石墨混合物的非等温动力学。为了测定动力学参数,选取研磨活化2 h和4 h的及未球磨的Ag2O-石墨混合物为样品。基于Vyazovkin法计算得到的活化能最大值和最小值之间的差比平均活化能小20%~30%((99.38±2.36)k J/mol),Ag2O机械活化2 h的热分解是一个多步过程,机械活化4 h的热分解是一个单步过程(平均活化能为(93.68±2.26)k J/mol)。动力学模型表明,未球磨的Ag2O-石墨混合物的热分解过程比其他的复杂。Ag2O-石墨混合物的自动催化趋势比其他的低。
The non-isothermal kinetics of mechanochemical reduction of Ag2O and graphitic mixtures was investigated by DSC and TGA, model fitted Malek method and model-free modified Vyazovkin method. In order to determine the kinetic parameters, the Ag2O-graphite mixture that was ground for 2 h and 4 h and not milled was selected as the sample. The difference between the maximum value and the minimum value of the activation energy calculated based on the Vyazovkin method is 20% -30% (99.38 ± 2.36) kJ / mol less than the average activation energy. The thermal decomposition of Ag2O by mechanical activation for 2 h is more The thermal decomposition of mechanical activation for 4 h was a one-step process (average activation energy was (93.68 ± 2.26) kJ / mol). The kinetic model shows that the thermal decomposition of the unmilled Ag2O-graphite mixture is more complicated than the others. The auto-catalytic tendency of the Ag2O-graphite mixture is lower than the others.