Study On The Microstructure And Methane Adsorption Of Deformed Coal

Deformed coal in formation process will be affected by different tectonic action, these tectonic action to make coal deformation, these deformation includes not only the macro deformation also include micro deformation. Previous people have more research on macro deformation to the influence of methane adsorption and less research on micro deformation to the influence of methane adsorption, So this paper research from micro deformation of the coal, Analyses the microstructure of coal tectonism the effects of changes, discusses the microstructure of deformed coal and correlation of methane adsorption.This paper elected deformed coal of cutting shear and bedding shear to research, through nuclear magnetic resonance (NMR) experiment get the different types of deformed coal of 13C NMR spectrum diagram, and through the spectrum of the solution stack and peak fitting, Find the relative content of the fa.,The fa. of deformed coal are more than nature coal.Through FT-IR experiment get different types tectonic coal infrared spectra of the various groups, obtained the peak positions information.Compares the peak positions such as changes in theμC H2.After tectonic action,the peak position is blue shift. By soxhlet extraction experiments under different tectonic action obtained low molecular weight compounds in coal,coal and coal residue to nitrogen adsorption and scanning electron microscopy experiments, Discusses the surface topography of samples of pore size distribution, gap and the influence of gas adsorption.According to the functional groups in coal select the appropriate model compound foradsorption isotherm experiments were determined at different functional groups on the strength of adsorption of methane. The results show that different tectonic function, deformed coal are different of structure and composition, tectonic action will be accelerated aromatization of the coal. Low molecular weight compounds present in the pores into, through solvent extraction, reduce the low molecular weight compounds, the increases and increased porosity, is conducive to methane adsorption. However, by comparing a chloroform extraction residue after THF extraction residue, that is not the more reduce low molecular weight compounds, the greater the adsorption. THF extraction rate is higher than chloroform,but liquid nitrogen adsorption capacity below chloroform. And by the scanning electron microscope to observe, mainly in micropores among the adsorbed gases, THF extraction residue expansion of large pores, pore reduction, is not conducive to adsorption of gases. Through to model compound of isothermal adsorption experiments, learned that the selection of oxygen in the number of functional groups, the more the better adsorption; One of the groups anhydride with strong adsorption.