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用非等温动力学方法对氢氧化镁的热分解动力学进行了研究.分解反应机理符合晶核形成及生长机理A,且随着升温速率的升高,机理由A 2 转变为A 1.5.根据K issinger非机理方程计算和数值回归方法验证所得的分解反应活化能结果相互印证,约为148 kJ·m ol-1.进一步研究发现,水蒸气的存在对氢氧化镁热分解反应具有非常明显的影响,可能是其动力学机理随升温速率升高而改变的主要影响因素.
The kinetics of thermal decomposition of magnesium hydroxide was studied by non-isothermal kinetic method. The mechanism of decomposition reaction conformed to nucleation and growth mechanism A, and the mechanism changed from A 2 to A 1.5 with the increase of heating rate. K issinger non-mechanistic equation calculation and numerical regression method to verify the decomposition reaction activation energy results confirmed each other, about 148 kJ · mol-1. Further study found that the presence of water vapor on magnesium hydroxide pyrolysis reaction has a very significant Influence, may be the main influencing factor of the change of its kinetic mechanism with the increase of heating rate.