Thermal decomposition kinetics of humic acid

CHENG Liang; ZHANG Baolin; XU Li; HOU Cuihong; LIU Guoji

doi:10.3969/j.issn.0438-1157.2014.09.022

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Thermal decomposition kinetics of humic acid

更新时间：2025-12-10

- Thermal decomposition kinetics of humic acid
- CIESC Journal Issue 9, Pages: 3470-3478(2014)
- 作者机构：
  
  郑州大学化工与能源学院,河南,郑州,450001
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.09.022
  CLC： Q013.1
- Online First：05 September 2014，
  
  Published：05 September 2014
- 稿件说明：
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CHENG Liang, ZHANG Baolin, XU Li, et al. Thermal decomposition kinetics of humic acid[J]. CIESC Journal, 2014, (9): 3470-3478.
DOI：

CHENG Liang, ZHANG Baolin, XU Li, et al. Thermal decomposition kinetics of humic acid[J]. CIESC Journal, 2014, (9): 3470-3478. DOI： 10.3969/j.issn.0438-1157.2014.09.022.

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Šatava-Šesták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。

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 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.

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