烟酸锶[Sr(C_6H_4NO_2)_2·3H_2O]的热解动力学  

Thermal Decomposition Kinetics of Sr(C_6H_4NO_2)_2·3H_2O

作　　者：廖辉伟[1] 潘雅妹[1] 周远[1] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010

出　　处：《高校化学工程学报》2014年第3期472-476,共5页Journal of Chemical Engineering of Chinese Universities

基　　金：国家科技支撑计划(2009BAE85B02)

摘　　要：采用TG-DTG/DTA等方法对新合成的烟酸锶[Sr(C6H4NO2)2·3H2O]的热解过程及其动力学行为进行了研究,并利用非等温动力学原理,通过Flynn-Wall-Ozawa,Kissinger,Friedman和Freeman-Carroll等方法,计算得到烟酸锶三步热解过程的动力学参数。结果表明烟酸锶的热解分为三步,第一步为失去结晶水的过程,第二步和第三步为配体失去和配合物结构坍塌的过程;活化能(E)分别为(68.03±0.38),(369.98±9.76),(255.53±7.53)kJ·mol-1;指前因子(lgA)分别为7.68,24.69,12.88;反应级数(n)分别为1.1,2.8,1.4。同时采用Coats-Redfern法确定了烟酸锶三步热解阶段可能的机理函数及热解动力学方程。通过多步线性回归方法,确定烟酸锶三步热解过程的最佳动力学模型分别为F1(n=1),2D(n=2),AE4(n=4)。The thermal decomposition process and kinetics of [Sr（C6H4NO2）2·3H2O] were investigated by TG-DTG/DTA. Following the non-isothermal kinetics theory and Flynn -Wall-Ozawa, Kissinger, Friedman and Freeman-Carroll methods, the kinetic parameters of the thermal decomposition of [Sr（C6H4NO2）2·3H2O] were obtained. The results show that the pyrolysis process can be divided into three steps：the first step is the loss of crystallized water;the second and the third steps are the loss of ligands and the collapse of the complex structure, respectively. The kinetic equations for the thermal decomposition steps were obtained by the Coats-Redfern method. The results calculated for each step are：E=（68.03±0.38）, （369.98±9.76）, （255.53±7.53） kJ·mol-1 （activation energy （E））, lgA=7.68, 24.69, 12.88 （frequency factor （A））;n=1.1, 2.8, 1.4 （reaction order （n））, respectively. A possible kinetic model is established as F1（n =1）, 2D（n =2）, AE4（n =4） via the multiple linear regression method.

关 键 词：烟酸锶 热解 热解动力学 热重法 

分 类 号：O642.3[理学—物理化学]