Microwave irradiation-induced alterations in physicochemical properties and methane adsorption capability of coals: An experimental study using carbon molecular sieve

doi:10.1016/j.cjche.2023.12.020

中国化学工程学报 ›› 2024, Vol. 68 ›› Issue (4): 165-180.DOI: 10.1016/j.cjche.2023.12.020

Microwave irradiation-induced alterations in physicochemical properties and methane adsorption capability of coals: An experimental study using carbon molecular sieve

Xuexiang Fu, Xing Tang, Yi Xu, Xintao Zhou, Dengfeng Zhang

Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China

收稿日期:2023-08-28 修回日期:2023-11-21 出版日期:2024-04-28 发布日期:2024-06-28
通讯作者: Dengfeng Zhang,Tel.:+86 871 65920242.E-mail address:plum0627@163.com
基金资助:
This study is financially supported by the National Natural Science Foundation of China (42272202 and 52264001), the Yunnan Fundamental Research Projects (202201AT070144), and the Yunnan Ten Thousand Talents Plan Young & Elite Talents Project (YNWRQNBJ-2019-164), and Training Programmes of Innovation and Entrepreneurship for Undergraduates of Yunnan Province (S202210674128).

Microwave irradiation-induced alterations in physicochemical properties and methane adsorption capability of coals: An experimental study using carbon molecular sieve

Xuexiang Fu, Xing Tang, Yi Xu, Xintao Zhou, Dengfeng Zhang

Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China

Received:2023-08-28 Revised:2023-11-21 Online:2024-04-28 Published:2024-06-28
Contact: Dengfeng Zhang,Tel.:+86 871 65920242.E-mail address:plum0627@163.com
Supported by:
This study is financially supported by the National Natural Science Foundation of China (42272202 and 52264001), the Yunnan Fundamental Research Projects (202201AT070144), and the Yunnan Ten Thousand Talents Plan Young & Elite Talents Project (YNWRQNBJ-2019-164), and Training Programmes of Innovation and Entrepreneurship for Undergraduates of Yunnan Province (S202210674128).

摘要/Abstract

摘要： In order to comprehend the applicability of microwave irradiation for recovering coalbed methane, it is necessary to evaluate the microwave irradiation-induced alterations in coals with varying levels of metamorphism. In this work, the carbon molecular sieve combined with KMnO₄ oxidation was selected to fabricate carbon molecular sieve with diverse oxidation degrees, which can serve as model substances toward coals. Afterwards, the microwave irradiation dependences of pores, functional groups, and high-pressure methane adsorption characteristics of model substances were studied. The results indicated that microwave irradiation causes rearrangement of oxygen-containing functional groups, which could block the micropores with a size of 0.40-0.60 nm in carbon molecular sieve; meanwhile, naphthalene and phenanthrene generated by macro-molecular structure pyrolysis due to microwave irradiation could block the micropores with a size of 0.70-0.90 nm. These alterations in micropore structure weaken the saturated methane adsorption capacity of oxidized carbon molecular sieve by 2.91%-23.28%, suggesting that microwave irradiation could promote methane desorption. Moreover, the increased mesopores found for oxidized carbon molecular sieve after microwave irradiation could benefit CH₄ diffusion. In summary, the oxidized carbon molecular sieve can act as model substances toward coals with different ranks. Additionally, microwave irradiation is a promising technology to enhance coalbed methane recovery.

关键词: Microwave irradiation, Physicochemical property, Coal matrix, Adsorption, Carbon molecular sieve

Abstract: In order to comprehend the applicability of microwave irradiation for recovering coalbed methane, it is necessary to evaluate the microwave irradiation-induced alterations in coals with varying levels of metamorphism. In this work, the carbon molecular sieve combined with KMnO₄ oxidation was selected to fabricate carbon molecular sieve with diverse oxidation degrees, which can serve as model substances toward coals. Afterwards, the microwave irradiation dependences of pores, functional groups, and high-pressure methane adsorption characteristics of model substances were studied. The results indicated that microwave irradiation causes rearrangement of oxygen-containing functional groups, which could block the micropores with a size of 0.40-0.60 nm in carbon molecular sieve; meanwhile, naphthalene and phenanthrene generated by macro-molecular structure pyrolysis due to microwave irradiation could block the micropores with a size of 0.70-0.90 nm. These alterations in micropore structure weaken the saturated methane adsorption capacity of oxidized carbon molecular sieve by 2.91%-23.28%, suggesting that microwave irradiation could promote methane desorption. Moreover, the increased mesopores found for oxidized carbon molecular sieve after microwave irradiation could benefit CH₄ diffusion. In summary, the oxidized carbon molecular sieve can act as model substances toward coals with different ranks. Additionally, microwave irradiation is a promising technology to enhance coalbed methane recovery.

Key words: Microwave irradiation, Physicochemical property, Coal matrix, Adsorption, Carbon molecular sieve

Xuexiang Fu, Xing Tang, Yi Xu, Xintao Zhou, Dengfeng Zhang. Microwave irradiation-induced alterations in physicochemical properties and methane adsorption capability of coals: An experimental study using carbon molecular sieve[J]. 中国化学工程学报, 2024, 68(4): 165-180.

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Microwave irradiation-induced alterations in physicochemical properties and methane adsorption capability of coals: An experimental study using carbon molecular sieve

Microwave irradiation-induced alterations in physicochemical properties and methane adsorption capability of coals: An experimental study using carbon molecular sieve

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