Thermal decomposition kinetics of humic acid

被引：0

作者：

Cheng, Liang ^{[1
]}

Zhang, Baolin ^{[1
]}

Xu, Li ^{[1
]}

Hou, Cuihong ^{[1
]}

Liu, Guoji ^{[1
]}

机构：

[1] School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, 450001, Henan

来源：

Huagong Xuebao/CIESC Journal | 2014年 / 65卷 / 09期

关键词：

Enthalpy; Humic acid; Kinetics; Mechanism; NMR; Thermal decomposition;

D O I：

10.3969/j.issn.0438-1157.2014.09.022

中图分类号：

学科分类号：

摘要：

Process and kinetics of thermal decomposition of humic acid were studied with TG-DTG techniques. Thermal decomposition temperature of humic acid was in the range of 284.65-417.16℃. The structure of humic acid was characterized with FT-IR, 1H NMR and 13C NMR. The kinetic parameters, including activation energy and pre-exponential factor of the thermal decomposition process of humic acid were calculated with the Flynn-Wall-Ozawa (FWO), Kissinger and Šatava-Šesták method respectively. Activation energy and logarithmic value of pre-exponential factor were found to be 210.83 kJ·mol-1 and 17.55, respectively. Moreover, reaction order and mechanism of thermal decomposition and thermodynamic parameters were also studied. Thermal decomposition of humic acid was a second-order reaction, and the mechanism of the decomposition process was obtained. The maximal used temperature of humic acid maintaining one-minute lifetime in N2 atmosphere was 278℃. Meanwhile, the thermodynamic paramaters of ΔH≠, ΔS≠ and ΔG≠ were calculated as 67.99 kJ·mol-1, -164.83 J·(mol·K)-1 and 176.36 kJ·mol-1, respectively. © All Rights Reserved

引用

页码：3470 / 3478

页数：8

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