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国际煤炭科学技术学报（英文）
国际煤炭科学技术学报（英文）

季刊

2095-8293

国际煤炭科学技术学报（英文）/Journal International Journal of Coal Science & TechnologyCSCDCSTPCD北大核心
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    Organic petrographic and mineralogical composition of the No.6 coal seam of the Soutpansberg Coalfield,South Africa:Insights into paleovegetation and depositional environment

    Sanki BiswasNicola J.WagnerOfentse M.Moroeng
    190-207页
    查看更多>>摘要：This study investigates the paleodepositional conditions of the No.6 Seam of the Madzaringwe Formation in Makhado and Voorburg south area of the Soutpansberg Coalfield(Limpopo Province,South Africa)utilizing organic petrography and inorganic geochemical proxies.The coals are predominantly high-volatile bituminous B-A rank with high ash yields(avg.36.1 wt％),characterized by high-vitrinite(～41.5 vol％),moderate-to-high inertinite(9.8 vol％-33.7 vol％)and low liptinite(～2.3 vol％).The distribution of inertinite varies among different coal horizons(from bottom-lower to middle-upper),sug-gesting differential oxidation conditions and/or paleofire occurrence.Vitrinite-to-inertinite(V/I)ratio,tissue preservation-gelification index(TPI-GI),and groundwater-vegetation index(GWI-VI)plots,indicate that the peat-forming forest-swamp vegetation accumulated under mesotrophic-to-rheotrophic hydrological conditions.The presence of structured macerals(i.e.,telinite,collotelinite,fusinite,and semifusinite)suggests well-preserved plant tissues,whereas framboidal pyrite and sulphur content(0.24 wt％-2.16 wt％)point to brackish-water influence at the peat stage.The coals contain quartz,kaolinite,siderite,muscovite,dolomite,calcite,and pyrite minerals,most of which were likely sourced from felsic igneous rocks.The Al/(Al+Fe+Mn)and(Fe+Mn)/Ti ratios for the studied samples range between 0.24-0.97 and 0.57-70.10,respectively.The ratios,Al-Fe-Mn plot,and presence of massive botryoidal-type pyrite imply some influence of meteoric waters or flu-ids from hydrothermal activity post-deposition.Moreover,the chemical index of alteration(CIA:98.25-99.67),chemical index of weathering(CIW:92.04-97.66),and A-CN-K ternary diagram suggest inorganic matter suffered strong chemical weathering,indicating warm paleoclimatic conditions during the coal formation.
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    Photocatalytic degradation of methylene blue over MIL-100(Fe)/GO composites:a performance and kinetic study

    Yuxue WeiZhiyuan FuYingzi MengChun Li...
    208-222页
    查看更多>>摘要：Adsorption coupled with photocatalytic degradation is proposed to fulfill the removal and thorough elimination of organic dyes.Herein,we report a facile hydrothermal synthesis of MIL-100(Fe)/GO photocatalysts.The adsorption and pho-tocatalytic degradation process of methylene blue(MB)on MIL-100(Fe)/GO composites were systematically studied from performance and kinetic perspectives.A possible adsorption-photocatalytic degradation mechanism is proposed.The optimized 1M8G composite achieves 95％MB removal(60.8 mg/g)in 210 min and displays well recyclability over ten cycles.The obtained MB adsorption and degradation results are well fitted onto Langmuir isotherm and pseudo-second order kinetic model.This study shed light on the design of MOFs based composites for water treatment.
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    Effect mechanism of seepage force on the hydraulic fracture propagation

    Haiyang WangDesheng ZhouYi ZouPeng Zheng...
    223-240页
    查看更多>>摘要：The flow of fluid through the porous matrix of a reservoir rock applies a seepage force to the solid rock matrix.Although the seepage force exerted by fluid flow through the porous matrix of a reservoir rock has a notable influence on rock deformation and failure,its effect on hydraulic fracture(HF)propagation remains ambiguous.Therefore,in this study,we improved a traditional fluid-solid coupling method by incorporating the role of seepage force during the fracturing fluid seepage,using the discrete element method.First,we validated the simulation results of the improved method by comparing them with an analytical solution of the seepage force and published experimental results.Next,we conducted numerical simulations in both homogeneous and heterogeneous sandstone formations to investigate the influence of seepage force on HF propaga-tion.Our results indicate that fluid viscosity has a greater impact on the magnitude and extent of seepage force compared to injection rate,and that lower viscosity and injection rate correspond to shorter hydraulic fracture lengths.Furthermore,seepage force influences the direction of HF propagation,causing HFs to deflect towards the side of the reservoir with weaker cementation and higher permeability.
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    Failure characteristics and fracture mechanism of overburden rock induced by mining:A case study in China

    Jiawei LiMeng ZhangChangxiang WangChanglong Liao...
    241-255页
    查看更多>>摘要：This study employs similar simulation testing and discrete element simulation coupling to analyze the failure and deformation processes of a model coal seam's roof.The caving area of the overburden rock is divided into three zones:the delamination fracture zone,broken fracture zone,and compaction zone.The caving and fracture zones'heights are approximately 110 m above the coal seam,with a maximum subsidence of 11 m.The delamination fracture zone's porosity range is between 0.2 and 0.3,while the remainder of the roof predominantly exhibits a porosity of less than 0.1.In addition,the numerical model's stress analysis revealed that the overburden rock's displacement zone forms an'arch-beam'structure starting from 160 m,with the maximum and minimum stress values decreasing as the distance of advancement increases.In the stress beam interval of the overburden rock,the maximum value changes periodically as the advancement distance increases.Based on a comparative analysis between observable data from on-site work and numerical simulation results,the stress data from the numerical simulation are essentially consistent with the actual results detected on-site,indicating the validity of the numerical simulation results.
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    Screening the optimal Cox/CeO2(110)(x=1-6)catalyst for methane activation in coalbed gas

    Li'nan HuangDanyang LiLei JiangZhiqiang Li...
    256-271页
    查看更多>>摘要：The challenges posed by energy and environmental issues have forced mankind to explore and utilize unconventional energy sources.It is imperative to convert the abundant coalbed gas(CBG)into high value-added products,i.e.,selective and efficient conversion of methane from CBG.Methane activation,known as the"holy grail",poses a challenge to the design and development of catalysts.The structural complexity of the active metal on the carrier is of particular concern.In this work,we have studied the nucleation growth of small Co clusters(up to Co6)on the surface of CeO2(110)using density functional theory,from which a stable loaded Co/CeO2(110)structure was selected to investigate the methane activation mechanism.Despite the relatively small size of the selected Co clusters,the obtained Cox/CeO2(110)exhibits interesting properties.The optimized Co5/CeO2(110)structure was selected as the optimal structure to study the activation mechanism of methane due to its competitive electronic structure,adsorption energy and binding energy.The energy bar-riers for the stepwise dissociation of methane to form CH3*,CH2*,CH*,and C*radical fragments are 0.44,0.55,0.31,and 1.20 eV,respectively,indicating that CH*dissociative dehydrogenation is the rate-determining step for the system under investigation here.This fundamental study of metal-support interactions based on Co growth on the CeO2(110)surface contributes to the understanding of the essence of Co/CeO2 catalysts with promising catalytic behavior.It provides theoretical guidance for better designing the optimal Co/CeO2 catalyst for tailored catalytic reactions.
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