采用反相微乳法制备和超临界干燥获得前驱体BaO·MnO·6Al_2O_3.利用TG-DTA曲线和XRD分析对前驱体的热分解过程进行研究,并用Coats-Redfem法和Kissinger法进一步研究前驱体的热分解动力学,获得六铝酸盐催化剂前驱体热分解的机制函数为:积分式G(α)=[-ln(1-α)]~4,微分式为:f(α)=(1/4)(1-α)[-ln(1-α)]~(-3),反应为随机成核和随后生长控制,计算出的活化能E_a=187.80 kJ·mol~(-1).
The precursor BaO·MnO·6Al_2O_3 of catalyst BaMnAl_(11)O_(19-δ )was prepared by reverse microemulsion method and dried by supercritical drying.The thermal decomposition process of the precursor was studied with TG-DTA and XRD.And the thermal decomposition kinetics of the precursor was studied with Coats-Redfem methed and Kissinger method.According to the calculation results of Kissinger method and Coats-Redfem method,the thermal decomposition mechanism function of the precursor could be described as integral form G(α)=[-ln(1-α)]~4 and differential form f(α)=(1/4)(1-α)[-ln(1-α)]~(-3).The thermal decomposition reaction of the precursor was followed with the mechanism of random nucleation and subsequent growth.And the activation energy was187.80kJ·mol_(-1).
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