Mn2O3/HY催化聚丙烯的临氧裂解反应动力学

Kinetics of polypropylene catalytic cracking oxidation over Mn2O3/HY

采用热重分析仪,在常压O2气氛(流量为50 mL/min)中,以不同的速率(10、20和30℃/min)升温,研究Mn2O3/HY催化聚丙烯的临氧裂解反应,采用高斯拟合峰模型对反应进行分析,并使用分布活化能模型(DAEM)得到动力学预测曲线。结果表明:高斯拟合峰模型可以对聚丙烯临氧裂解各反应阶段进行较好的拟合,聚丙烯的临氧裂解反应由催化裂解、催化氧化和积碳消除组成。根据DAEM计算得到的拟合曲线的相关系数(r2)均为0.97,且由动力学参数得到的预测曲线与实验曲线的拟合度较高,表明DAEM适用于有机固废的临氧裂解反应,具有较高的可靠性。通过不同升温速率的预测曲线得知,升温速率的不断增大,会使得临氧裂解反应过程中的催化裂解反应与催化氧化反应的协同效应显著增强。

The pyrolysis of polypropylene(PP)catalyzed by Mn2O3/HY was studied by thermogravimetry at different heating rates(10,20 and 30℃/min)in O2 atmosphere at atmospheric pressure(flow rate of 50 mL/min).The reaction was analyzed by Gaussian fitting peak model,and the kinetic prediction curve was obtained by distributed activation energy model(DAEM).Results showed that the Gaussian fitting peak model could fit the reaction stages of polypropylene pyrolysis in the presence of oxygen,which was composed by catalytic cracking,catalytic oxidation and carbon deposition elimination.The correlation coefficients(r2)of the fitting curves calculated by distributed activation energy model were all 0.97,and the fitting degree of the prediction curves obtained from kinetic parameters was higher than that of the experimental curves,indicating that distributed activation energy model was suitable for the oxygen pyrolysis reaction of organic solid waste and had high reliability.According to the prediction curves at different heating rates,the synergistic effect of catalytic cracking reaction and catalytic oxidation reaction would be significantly enhanced with the increasing of heating rate.