Microstructure Characteristics of Soft and Hard Coal and Its Influence on Gas Adsorption Capacity

IF 0.8 4区 工程技术 Q4 CHEMISTRY, MULTIDISCIPLINARY
Xianfeng Liu, Chuang Li, Baisheng Nie, Xueqi Jia, Yankun Ma
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Abstract

In order to better understand the microstructure characteristics of soft and hard coal and its influence on gas adsorption capacity, three groups of soft and hard coal samples with different maturities were collected for measurements from Ordos Basin. CH4 isothermal adsorption experiments were performed to analyze the gas adsorption characteristics. Pore distribution and oxygen-containing groups of these soft and hard coals were detected by low-pressure N2 adsorption and Fourier Transform Infrared Spectroscopy (FTIR), respectively. For the collected FTIR spectrum, the peak-fitting method is used to semi-quantitatively study the distribution of oxygen-containing groups. Comparison of microstructure characteristics and methane adsorption capacity has also been made between soft and hard coal samples. The results showed that soft coals has smaller pore diameter and the micropore and mesopore surface area is 43.2–75.1 and 12.2–41.1% greater than that of corresponding hard coal, respectively, but the macropore surface area is 18.9–66.7% less than that of hard coals. The aromaticity of hard bituminous coals is smaller than that of the corresponding soft coals, while the peak areas of carbonyl and hydroxyl groups are obviously larger than that of the corresponding soft bituminous coals. However, the distribution of oxygen-containing groups in soft and hard anthracite exhibits the opposite trend. Tectonic deformation contributes to the decline of oxygen-containing groups and can enhance the maturity and pore surface area of bituminous coals, exhibiting superior methane adsorption property compared with hard bituminous coals. Though soft anthracite has developed micropore/mesopore structures, its lower maturity and higher content of oxygen-containing groups lead to the decline of gas adsorption capacity. Gas adsorption behaviors of coal are closely related to the complex microstructures, and the combined effects of physical structures and chemical groups should be taken into account.

Abstract Image

软硬煤的微观结构特征及其对气体吸附能力的影响
为了更好地了解软硬煤的微观结构特征及其对气体吸附能力的影响,在鄂尔多斯盆地采集了3组不同成熟度的软硬煤样品进行了测量。通过等温吸附实验分析了甲烷的吸附特性。采用低压氮气吸附和傅里叶变换红外光谱(FTIR)分别检测了软煤和硬煤的孔隙分布和含氧基团。对采集到的FTIR光谱,采用峰拟合方法对含氧基团的分布进行半定量研究。比较了软、硬煤样品的微观结构特征和甲烷吸附能力。结果表明:软煤的孔径较小,微孔和中孔表面积分别比对应的硬煤大43.2 ~ 75.1和12.2 ~ 41.1%,大孔表面积比对应的硬煤小18.9 ~ 66.7%;硬质烟煤的芳香度小于相应的软质烟煤,羰基和羟基的峰面积明显大于相应的软质烟煤。而软硬无烟煤中含氧基团的分布则呈现相反的趋势。构造变形使含氧基团减少,提高了烟煤的成熟度和孔表面积,表现出比硬质烟煤更优越的甲烷吸附性能。软质无烟煤虽然发育微孔/中孔结构,但其成熟度较低,含氧基团含量较高,导致气体吸附能力下降。煤的气体吸附行为与煤的复杂微观结构密切相关,需要考虑煤的物理结构和化学基团的共同作用。
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来源期刊
Solid Fuel Chemistry
Solid Fuel Chemistry CHEMISTRY, MULTIDISCIPLINARY-ENERGY & FUELS
CiteScore
1.10
自引率
28.60%
发文量
52
审稿时长
6-12 weeks
期刊介绍: The journal publishes theoretical and applied articles on the chemistry and physics of solid fuels and carbonaceous materials. It addresses the composition, structure, and properties of solid fuels. The aim of the published articles is to demonstrate how novel discoveries, developments, and theories may be used in improved analysis and design of new types of fuels, chemicals, and by-products. The journal is particularly concerned with technological aspects of various chemical conversion processes and includes papers related to geochemistry, petrology and systematization of fossil fuels, their beneficiation and preparation for processing, the processes themselves, and the ultimate recovery of the liquid or gaseous end products.
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