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根据一水硬铝石 (α AlOOH)分解前后的X射线衍射 (XRD)谱 ,判断其热分解后主要生成α Al2 O3 。分别用Coats Redfern积分法和Kissinger方法处理了不同升温速率下一水硬铝石的差热曲线 ,两种方法得到的热分解反应动力学参数非常接近 ,计算所得的活化能分别为 2 5 4 .5 4kJ/mol和 2 4 4 .0 8kJ/mol,并推断了反应的动力学模型和反应机理。研究表明一水硬铝石的热分解符合Mample单行法则 ,相对应的机理为随机成核和随后增长。
According to the X-ray diffraction (XRD) spectra of diaspore (α AlOOH) before and after decomposition, it was found that α Al 2 O 3 mainly formed after thermal decomposition. The differential thermal curves of diaspore at different heating rates were dealt with Coats Redfern integral method and Kissinger method, respectively. The kinetic parameters of the thermal decomposition of the two methods were very close, and the calculated activation energies were respectively 254. 5 4 kJ / mol and 2 4 4 .0 8 kJ / mol respectively. The kinetic model and reaction mechanism were deduced. The study shows that the thermal decomposition of diaspore is in accordance with the Mample single-row rule, and the corresponding mechanism is random nucleation and subsequent growth.