Effects of Pore Structure of Different Rank Coals on Methane Adsorption Heat

Adsorption thermodynamic characteristics are an important part of the methane adsorption mechanism, and are useful for understanding the energy transmission mechanism of coalbed methane (CBM) migration in coal reservoirs. To study the effect of coal pore characteristics on methane adsorption heat, f...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Haijian Li, Shengcheng Wang, Qiang Zeng, Jianhong Kang, Weiming Guan, Wentao Li
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	coal coalbed methane pore structure adsorption capacity adsorption heat Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/8ba6ea682efa44b894189d9775c32565
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:8ba6ea682efa44b894189d9775c32565
record_format	dspace
spelling	oai:doaj.org-article:8ba6ea682efa44b894189d9775c325652021-11-25T18:51:00ZEffects of Pore Structure of Different Rank Coals on Methane Adsorption Heat10.3390/pr91119712227-9717https://doaj.org/article/8ba6ea682efa44b894189d9775c325652021-11-01T00:00:00Zhttps://www.mdpi.com/2227-9717/9/11/1971https://doaj.org/toc/2227-9717Adsorption thermodynamic characteristics are an important part of the methane adsorption mechanism, and are useful for understanding the energy transmission mechanism of coalbed methane (CBM) migration in coal reservoirs. To study the effect of coal pore characteristics on methane adsorption heat, five different types of rank coals were used for low-pressure nitrogen, low-pressure carbon dioxide, and methane adsorption experiments. Pore structure and adsorption parameters, including maximum adsorption capacity and adsorption heat, were obtained for five coal samples, and their relationships were investigated. The results show that the low-pressure nitrogen adsorption method can measure pores within 1.7–300 nm, while the low-pressure carbon dioxide adsorption method can measure micropores within 0.38–1.14 nm. For the five coal samples, comprehensive pore structure parameters were obtained by combining the results of the low-pressure nitrogen and carbon dioxide adsorption experiments. The comprehensive results show that micropores contribute the most to the specific surface area of anthracite, lean coal, fat coal, and lignite, while mesopores contribute the most to the specific surface area of coking coal. Mesopores contribute the most to the pore volume of the five coal samples. The maximum adsorption capacity has a significant positive correlation with the specific surface area and pore volume of micropores less than 2 nm, indicating that methane is mainly adsorbed on the surface of micropores, and can also fill the micropores. The adsorption heat has a significant positive correlation with the specific surface area and pore volume of micropores within 0.38–0.76 nm, indicating that micropores in this range play a major role in determining the methane adsorption heat.Haijian LiShengcheng WangQiang ZengJianhong KangWeiming GuanWentao LiMDPI AGarticlecoalcoalbed methanepore structureadsorption capacityadsorption heatChemical technologyTP1-1185ChemistryQD1-999ENProcesses, Vol 9, Iss 1971, p 1971 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	coal coalbed methane pore structure adsorption capacity adsorption heat Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	coal coalbed methane pore structure adsorption capacity adsorption heat Chemical technology TP1-1185 Chemistry QD1-999 Haijian Li Shengcheng Wang Qiang Zeng Jianhong Kang Weiming Guan Wentao Li Effects of Pore Structure of Different Rank Coals on Methane Adsorption Heat
description	Adsorption thermodynamic characteristics are an important part of the methane adsorption mechanism, and are useful for understanding the energy transmission mechanism of coalbed methane (CBM) migration in coal reservoirs. To study the effect of coal pore characteristics on methane adsorption heat, five different types of rank coals were used for low-pressure nitrogen, low-pressure carbon dioxide, and methane adsorption experiments. Pore structure and adsorption parameters, including maximum adsorption capacity and adsorption heat, were obtained for five coal samples, and their relationships were investigated. The results show that the low-pressure nitrogen adsorption method can measure pores within 1.7–300 nm, while the low-pressure carbon dioxide adsorption method can measure micropores within 0.38–1.14 nm. For the five coal samples, comprehensive pore structure parameters were obtained by combining the results of the low-pressure nitrogen and carbon dioxide adsorption experiments. The comprehensive results show that micropores contribute the most to the specific surface area of anthracite, lean coal, fat coal, and lignite, while mesopores contribute the most to the specific surface area of coking coal. Mesopores contribute the most to the pore volume of the five coal samples. The maximum adsorption capacity has a significant positive correlation with the specific surface area and pore volume of micropores less than 2 nm, indicating that methane is mainly adsorbed on the surface of micropores, and can also fill the micropores. The adsorption heat has a significant positive correlation with the specific surface area and pore volume of micropores within 0.38–0.76 nm, indicating that micropores in this range play a major role in determining the methane adsorption heat.
format	article
author	Haijian Li Shengcheng Wang Qiang Zeng Jianhong Kang Weiming Guan Wentao Li
author_facet	Haijian Li Shengcheng Wang Qiang Zeng Jianhong Kang Weiming Guan Wentao Li
author_sort	Haijian Li
title	Effects of Pore Structure of Different Rank Coals on Methane Adsorption Heat
title_short	Effects of Pore Structure of Different Rank Coals on Methane Adsorption Heat
title_full	Effects of Pore Structure of Different Rank Coals on Methane Adsorption Heat
title_fullStr	Effects of Pore Structure of Different Rank Coals on Methane Adsorption Heat
title_full_unstemmed	Effects of Pore Structure of Different Rank Coals on Methane Adsorption Heat
title_sort	effects of pore structure of different rank coals on methane adsorption heat
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/8ba6ea682efa44b894189d9775c32565
work_keys_str_mv	AT haijianli effectsofporestructureofdifferentrankcoalsonmethaneadsorptionheat AT shengchengwang effectsofporestructureofdifferentrankcoalsonmethaneadsorptionheat AT qiangzeng effectsofporestructureofdifferentrankcoalsonmethaneadsorptionheat AT jianhongkang effectsofporestructureofdifferentrankcoalsonmethaneadsorptionheat AT weimingguan effectsofporestructureofdifferentrankcoalsonmethaneadsorptionheat AT wentaoli effectsofporestructureofdifferentrankcoalsonmethaneadsorptionheat
_version_	1718410658193604608

Effects of Pore Structure of Different Rank Coals on Methane Adsorption Heat

Ejemplares similares