Citation: ZHOU Ya-Chong, ZHANG Sheng-Hui, OU Xue-Mei, ZHANG Xiao-Bin, ZHANG Xin. Thermal Decomposition Behavior and Deintercalation Kinetics of Kaolinite/ Benzamide Intercalation Complex[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(5): 985-990. doi: 10.3969/j.issn.1001-4861.2013.00.112
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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 deintercalation 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·mol-1, the range of pre-exponential factor A is 4.9×1010~8.8×1010 s-1. The optimized mechanism function is nth-order chemical reaction,the mechanism function is G(α)=[1-(1-α)1-n]/(1-n), f(α)=(1-α)n.
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