石墨结构层包覆铁纳米粒子的热分解动力学  

作　　者：曹宏[1,2] 马恩宝[1] 李儒[1] 宾晓蓓[3] 王学华[1] 

机构地区：[1]武汉工程大学材料学院 [2]湖北省等离子体化学与新材料重点实验室湖北武汉430073 [3]武汉理工大学资资源与环境工程学院

出　　处：《科技信息》2008年第1期17-18,共2页Science & Technology Information

基　　金：湖北省教育厅优秀中青年项目(2003B001);湖北省自然科学基金项目(2004ABA090)。

摘　　要：以二阶FeCl3石墨层间化合物为前驱体,制备了石墨结构层包覆铁纳米粒子复合材料(GEINP)。利用TG-DTA和XRD分析了GEINP的分解过程,发现在700℃以前样品基本稳定。将TG数据带入FWO公式计算了700-1150℃范围内GEINP的分解表观活化能E,E=226.21 kJ·mol-1。用Coats-Redfern方程拟合发现GEINP的分解机理与二维扩散一致,并计算了指前因子A和表观活化能E。Graphene encapsulated iron nanoparticles （GEINP） was synthesized by using potassium as reducer to deoxidize the precursor of FeCl3 graphite intercalation compound with 2 stage structure. The decomposition of GEINP was researched by TG-DTA and XRD, the results showed that GEINP was stable on the whole when the temperature was below 700℃. The apparent activation energy E was calculated by using Flynn-Wall-Ozawa method between 700℃ and 1150℃, E=226.21 kJ·mol^-1. It was found that the decomposition ＇mechanism of GEINP was according with 2-dimension diffusion model by using Coats-Redfern equation to fit the experimental data, and the pre-exponent factor A and apparent activation energy E were calculated at the same time.

关 键 词：石墨 铁 纳米粒子 热动力学 

分 类 号：TQ110[化学工程—无机化工] O613.71[理学—无机化学]