【摘要】 用非等温DSC和TC,在2,4,6,8 K·min-1四个不同的线性升温速率下,研究了分析纯硝酸铵(AN)、工业AN以及分析纯AN和NaNO3混合物的热分解动力学。结果表明,在反应深度为0.0-0.4区间内,AN热分解反应受随机成核和随后增长机理控制,机理函数为n=2／3的Avrami-Erofeev方程。含10％NaNO3的分析纯AN在同一反应深度区间内的分解过程归属一维相边界反应,机理函数为n=1／3的收缩球(体积)方程。分析纯AN(工业AN与之相似)以及含10％NaNO3混合物的动力学方程分别为:dα/dT=109.43(1-α)[-ln(1-α)]1/3exp(-1.319×104／T)和dα/dT=109.4(1-α)2/3exp(-1.566×104／T)表明,AN中加入少量NaNO3可以改善AN的热稳定性。更多还原

【Abstract】 The kinetics of the thermal decomposition reaction of analytically pure ammonium nitrate (AN) ,commercially pure AN and mixture of analytically pure AN and NaNO3 has been investigated by means of non-isothermal DSC and TG at various heating rates of 2,4,6,8 K · min-1 ,respectively. The result shows that the decomposition reaction in the conversion degree range of 0. 0 - 0. 4 for AN is controlled by nucleation and growth,and the mechanism function is Arrami-Erofeev equation with n =2/3. The decomposition process of the mixture in the conversion degree range of 0 -0. 4 is classified as one-dimension phase boundary reaction and the mechanism function is the contracting sphere (volume) equation with n = 1/3. The kinetic equations of analytically pure AN ( commercially pure AN is resembled) and the mixture are da/dT = 109.43(1 -α)[-ln(1 - α) ] 1/3exp( - 1.319 × 104/T) and da/df = 109.4(1 -α)2/3exp( - 1. 566 × 104/T) respectively,indicating that NaNO3 can improve the thermal stability of AN.更多还原