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Experimental study on physicochemical structure of different rank coals under acid solvent treatments and its effects on heat of gas adsorption
Journal of Petroleum Science and Engineering ( IF 5.168 ) Pub Date : 2022-01-21 , DOI: 10.1016/j.petrol.2022.110191
Shuo Zhang 1, 2, 3 , Zhiming Wang 1, 2 , Xiaodong Zhang 1, 4 , Fengjie Chen 1, 5 , Xiaoduo Ping 1 , Zeyuan Sun 1
Affiliation  

Physicochemical structure characteristics and its effects on the heat of gas adsorption are the foundation for coalbed methane (CBM) development. Herein, this paper selected different rank coals before and after acid treatments to analyze the relationship among nanopore structure, chemical functional groups and the heat of gas adsorption through low-temperature N2 adsorption, Fourier transform infrared spectroscopy (FTIR) and calorimetric tests. This enabled us to explore the effect of acid solvents on nanopore structure and functional groups, and finally reveal a coupling mechanism between physicochemical structure and gas adsorption. Results showed that the specific surface area of Brunauer-Emmett-Teller model (BET-SSA) and pore volume of Barret-Joyner-Halenda model (BJH-PV) decrease first and subsequently increase with increasing coal evolution before and after acid treatments. However, both pore structure parameters and fractal dimension show a decrease or an increase at different degrees under pore expansion and increase effects. On the other hand, after acid treatments, aliphatic structures evidently decrease and aromatic structures relatively increase. For oxygen-containing functional groups affected by ester hydrolysis and Fourier reaction, more carboxyl and hydroxyl groups appear but ether groups reduce. This suggests that acid treatment is actually accompanied by more physicochemical changes. Then, according to its physicochemical response, less aliphatic structures and more aromatic structures significantly contribute to appear more micropores. However, a non-significant effect of aliphatic structure on gas adsorption is observed, while micropores, aromatic structure and oxygen-containing groups give a positive effect on gas adsorption.



中文翻译:

酸性溶剂处理不同阶煤理化结构及其对瓦斯吸附热影响的试验研究,酸性溶剂处理不同阶煤理化结构及其对瓦斯吸附热影响的试验研究

物化结构特​​征及其对瓦斯吸附热的影响是煤层气(CBM)开发的基础。在此,本文选取酸处理前后的不同等级煤,分析纳米孔结构、化学官能团与低温N 2气体吸附热之间的关系。吸附、傅里叶变换红外光谱 (FTIR) 和量热测试。这使我们能够探索酸性溶剂对纳米孔结构和官能团的影响,最终揭示物理化学结构与气体吸附之间的耦合机制。结果表明,酸处理前后,随着煤演化的增加,Brunauer-Emmett-Teller 模型(BET-SSA)的比表面积和 Barret-Joyner-Halenda 模型(BJH-PV)的孔隙体积先减小后增大。但孔隙结构参数和分形维数在扩孔和扩孔效应下均呈现不同程度的减小或增大。另一方面,酸处理后,脂肪族结构明显减少,芳香族结构相对增加。对于受酯水解和傅里叶反应影响的含氧官能团,出现更多的羧基和羟基,但醚基减少。这表明酸处理实际上伴随着更多的物理化学变化。然后,根据其物理化学反应,较少的脂肪族结构和较多的芳香族结构显着有助于出现更多的微孔。然而,观察到脂肪族结构对气体吸附的影响不显着,而微孔、芳香族结构和含氧基团对气体吸附有积极影响。较少的脂肪族结构和较多的芳香族结构显着有助于出现更多的微孔。然而,观察到脂肪族结构对气体吸附的影响不显着,而微孔、芳香族结构和含氧基团对气体吸附有积极影响。较少的脂肪族结构和较多的芳香族结构显着有助于出现更多的微孔。然而,观察到脂肪族结构对气体吸附的影响不显着,而微孔、芳香族结构和含氧基团对气体吸附有积极影响。

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物化结构特​​征及其对瓦斯吸附热的影响是煤层气(CBM)开发的基础。在此,本文选取酸处理前后的不同等级煤,分析纳米孔结构、化学官能团与低温N 2气体吸附热之间的关系。吸附、傅里叶变换红外光谱 (FTIR) 和量热测试。这使我们能够探索酸性溶剂对纳米孔结构和官能团的影响,最终揭示物理化学结构与气体吸附之间的耦合机制。结果表明,酸处理前后,随着煤演化的增加,Brunauer-Emmett-Teller 模型(BET-SSA)的比表面积和 Barret-Joyner-Halenda 模型(BJH-PV)的孔隙体积先减小后增大。但孔隙结构参数和分形维数在扩孔和扩孔效应下均呈现不同程度的减小或增大。另一方面,酸处理后,脂肪族结构明显减少,芳香族结构相对增加。对于受酯水解和傅里叶反应影响的含氧官能团,出现更多的羧基和羟基,但醚基减少。这表明酸处理实际上伴随着更多的物理化学变化。然后,根据其物理化学反应,较少的脂肪族结构和较多的芳香族结构显着有助于出现更多的微孔。然而,观察到脂肪族结构对气体吸附的影响不显着,而微孔、芳香族结构和含氧基团对气体吸附有积极影响。较少的脂肪族结构和较多的芳香族结构显着有助于出现更多的微孔。然而,观察到脂肪族结构对气体吸附的影响不显着,而微孔、芳香族结构和含氧基团对气体吸附有积极影响。较少的脂肪族结构和较多的芳香族结构显着有助于出现更多的微孔。然而,观察到脂肪族结构对气体吸附的影响不显着,而微孔、芳香族结构和含氧基团对气体吸附有积极影响。

更新日期:2022-01-30
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