MnO_2热分解制备Mn_3O_4的动力学研究  

Kinetics of the preparation of Mn_3O_4 by decomposition of MnO_2

作　　者：郑炳年[1] 胡雪玲[2] 文衍宣[2] 

机构地区：[1]广西大学工程实践与训练中心,广西南宁530004 [2]广西大学化学化工学院,广西南宁530004

出　　处：《广西工学院学报》2007年第3期13-16,共4页Journal of Guangxi University of Technology

摘　　要：为了得到MnO2热分解制备Mn3O4的动力学方程,用TG/DTA和XRD研究MnO2的热分解过程。研究表明MnO2的分解是分步进行的,4MnO2=2Mn2O3+O2↑的动力学方程为G(α)=[-ln(1-α)]12(T<625℃)和G(α)=[-ln(1-α)]13(T≥625℃),表观活化能为90.239 kJ/mol;6Mn2O3=4Mn3O4+O2↑的动力学方程为G(α)=[-ln(1-α)]13,表观活化能为204.67 kJ/mol;两个过程属于晶核形成与增长控制过程。In order to obtain the decomposition kinetics of MnO2, its decomposition processes were investigated by TG/DTA and XRD. The kinetics equation is（T〈625℃）and（T≥625℃）for 4MnO2=2Mn2O3↑. and itsactivation energy is 90. 239kJ/mol. The kinetics equation is for 6Mn2O3=4Mn3O4＋O2↑.and its activation energy is 204.67kJ/mol. Two reactions were controlled by the nucleation and growth.

关 键 词：MN3O4 MNO2 分解动力学 

分 类 号：TQ137.1[化学工程—无机化工]