高岭石/苯甲酰胺插层复合物的热分解行为及脱嵌反应动力学  

Thermal Decomposition Behavior and Deintercalation Kinetics of Kaolinite/Benzamide Intercalation Complex

作　　者：周亚冲[1] 张生辉[1] 欧雪梅[1] 张晓彬[1] 张欣[1] 

机构地区：[1]中国矿业大学材料科学与工程学院,徐州221116

出　　处：《无机化学学报》2013年第5期985-990,共6页Chinese Journal of Inorganic Chemistry

基　　金：中国矿业大学中央高校基本科研业务费专项资金(2012LWA02)资助项目

摘　　要：以高岭石／二甲基亚砜为前驱体，利用置换法制备了高岭石／苯甲酰胺插层复合物。XRD和FTIR分析表明苯甲酰胺进人高岭石层间并与其形成新的氢键。采用TG、DSC研究了插层复合物的热分解行为。结果表明复合物在加热过程中发生两步分解，第-步是插层复合物的分解，即插层剂分子于231℃发生脱嵌，第二步为高岭石脱羟基的过程。针对第-阶段的脱嵌反应，采用等转化率法改进后的迭代法、Malek法以及Dollimore法等动力学方法计算得到了完整的动力学三因子：活化能E．=75．4kJ·mol-1，指前因子A的范围为4．9x1010-8．8x1010s-1，动力学方程为：G（a）=[1-（1-a）。1，（1-n）,f（a）=（1—a）n。The kaolinite/benzamide was prepared with a direct displacement intercalation method by using kaolinite/ DMSO intercalation complex as an intermediate. The XRD and FTIR results show that benzamide has inserted into kaolinite and formed new hydrogen bonds with the inner surface of kaolinite. The thermal decomposition behavior of the complex was studied by TG and DSC. The TG and DSC results indicate that the decomposition process of the complex proceeds in two steps. The first step is deinterealation of the intercalated benzamide at 231 ℃ and the second step is dehydroxylation of kaolinite. For the first step, the kinetic triplet of the complex was calculated by the Modified Iterative Iso-conversional Procedure, Malek and Dollimore methods. The activation energy Ea is 75.4 kJ. mo1-1, the range of pre-exponential factor A is 4.9x1010-8.8x1010 s-1. The optimized mechanism function is nth-order chemical reaction ,the mechanism function is G（a）=[1-（1-a）.1,（1-n）,f（a）=（1-a）n.

关 键 词：高岭石 苯甲酰胺 插层 热分解 动力学 

分 类 号：O643.12[理学—物理化学]