首页|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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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.

Microwave irradiationPhysicochemical propertyCoal matrixAdsorptionCarbon molecular sieve

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

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

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaYunnan Fundamental Research ProjectsYunnan Ten Thousand Talents Plan Young & Elite Talents ProjectTraining Programmes of Innovation and Entrepreneurship for Undergraduates of Yunnan Province

4227220252264001202201AT070144YNWRQNBJ-2019-164S202210674128

2024

10.1016/j.cjche.2023.12.020

中国化学工程学报(英文版)
中国化工学会

中国化学工程学报(英文版)

CSTPCDEI
影响因子：0.818
ISSN：1004-9541
年,卷(期)：2024.68(4)
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