Influence mechanism of physicochemical structure on gas adsorption characteristics of coalfield limestone
In order to clarify the influence mechanism of molecular structure and microscopic pores on the gas adsorption of coalfield limestone,the methods of elemental analysis,chemical detection,aperture analysis,CT testing,gas adsorption experi-ments and quantum chemical calculation were comprehensively used to characterize the physicochemical characteristics of limestone.The molecular structure was constructed and optimized,and the gas adsorption properties were studied.The results show that the coalfield limestone contains more C elements,organic functional groups and ordered aromatic layer,and the or-ganic matter has high degree of graphitization,large crystal and less defects,which are the chemical basis of gas adsorption.Reducing the ambient temperature,increasing the adsorption pressure or reducing the moisture content can weaken the CH4/CO2 competition of gas adsorption of limestone.The limestone contains a lot of adsorption pores with good connectivity and complex structure,and the pore system is more compact and the anisotropy is weaker,which are the physical basis of gas ad-sorption.The research results can provide theoretical basis for gas control in coal rock system.
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