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

作　　者：Xuexiang Fu Xing Tang Yi Xu Xintao Zhou Dengfeng Zhang 

机构地区：[1]Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第4期165-180,共16页中国化学工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(42272202 and 52264001);the Yunnan Fundamental Research Projects(202201AT070144);the Yunnan Ten Thousand Talents Plan Young&Elite Talents Project(YNWRQNBJ-2019-164);Training Programmes of Innovation and Entrepreneurship for Undergraduates of Yunnan Province(S202210674128).

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 KMnO_(4)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 highpressure 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 

分 类 号：TE37[石油与天然气工程—油气田开发工程]