摘要
在半封闭系统中采用直接热解三聚氰胺的方法制备了C3N4,XRD、XPS及元素分析的结果证明了产物是类石墨相C3N4(g-C3N4)。用热分析(TG/DTG)研究了g-C3N4的热分解过程。通过迭代法计算了热分解反应活化能Eα,采用积分法结合36种动力学函数来判断g-C3N4热分解的机理函数。计算结果表明,g-C3N4的平均热分解活化能Eα为178.59kJ/mol,可能的动力学函数积分形式是g(α)=[-ln(1-α)]4,指前因子A为21.67s-1,对应的热分解动力学方程为:dα/dT=21.6 7/βexp((-178.59×103)/RT)×1/4(1-α)[-ln(1-α)
Melamine was directly pyrolyzed in semi-closed system to prepare C3N4.The analytic results of XRD,XPS and element analysis（EA） proved that the product is graphite-like C3N4（g-C3N4）.The thermal decomposition processes taking place in g-C3N4 have been studied using TG-DTG technique.The iterative procedure method was employed to calculate the activation energy Eα,integral method with 36 types of kinetic function was proposed to define the most probable kinetic function.The decomposition kinetic parameters were determined,which the average activation energy Eα was 178.59kJ/mol,the most probable kinetic function belonged to g（α） =[-ln（1-α）]4,the pre-exponential A was 21.67s-1,and the corresponding thermal decomposition dynamic function was dα/dT=21.67/βexp（（-178.59×103）/RT）×1/4（1-α）[-ln（1-α）]-3.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第2期329-332,共4页
Journal of Functional Materials
基金
国家安全重大基础研究资助项目(51340030202)
关键词
非等温热重法
g-C3N4
热分解动力学
迭代法
non-isothermal kinetics
g-C3N4
thermal decomposition
iterative procedure method
