| 腐殖酸热分解动力学 |
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| 引用本文： | 程亮,张保林,徐丽,侯翠红,刘国际.腐殖酸热分解动力学[J].化工学报,2014,65(9):3470-3478. |
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| 作者姓名： | 程亮 张保林 徐丽 侯翠红 刘国际 |
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| 作者单位： | 郑州大学化工与能源学院, 河南 郑州 450001 |
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| 基金项目： | “十二五”国家科技计划项目（2011BAD11B05）；河南省科技厅基础与前沿项目（2011A530008）。 |
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| 摘 要： | 采用热重分析法（DTA-TGA）研究了腐殖酸的热分解过程及其动力学，分析其DTA-TGA曲线可得：热分解反应发生在284.65～417.16℃； 用红外光谱（FT-IR）、核磁氢谱（1H NMR）、核磁碳谱（13C NMR）对腐殖酸结构进行表征，用Flynn-Wall-Ozawa（F-W-O）法、Kissinger法及?atava-?esták法计算出腐殖酸热分解反应的表观活化能为210.83 kJ·mol-1，指前因子对数为17.55；确定了其热分解反应的级数和动力学参数，且热分解反应机理为二级反应；腐殖酸在氮气氛围下维持1min寿命的最高使用温度为278℃；同时，计算出腐殖酸样品热力学参数焓变、熵变及摩尔自由能变分别为67.99 kJ·mol-1、-164.83 J·（mol·K）-1 和176.36 kJ·mol-1。
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| 关 键 词： | 腐殖酸 热分解 动力学 机理 焓 核磁共振 |
| 收稿时间： | 2014-01-16 |
| 修稿时间： | 2014-04-11 |
Thermal decomposition kinetics of humic acid |
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| CHENG Liang,ZHANG Baolin,XU Li,HOU Cuihong,LIU Guoji.Thermal decomposition kinetics of humic acid[J].Journal of Chemical Industry and Engineering(China),2014,65(9):3470-3478. |
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| Authors: | CHENG Liang ZHANG Baolin XU Li HOU Cuihong LIU Guoji |
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| Affiliation: | School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, Henan, China |
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| Abstract: | 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 ?atava-?esták 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. |
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| Keywords: | humic acid thermal decomposition kinetics mechanism enthalpy NMR |
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