Influence of fixed carbon on coal textural character and methane adsorption capacity
Abstract：Four kinds of coal with different fixed carbon content were selected as experimental samples. The sur- face morphology and textural character of the samples were characterized by scanning electron microscope ( SEM), N2 adsorption-desorption at 77 K, respectively, and their specific surface, pore volume and pore-size distribution were cal- culated based on N2 adsorption-desorption isotherms. And the volumetric method was used to determine its performance of methane adsorption. The influences of fixed carbon content on coal surface morphology, specific surface area, pore volume, pore size distribution and methane sorption capacity were discussed. The results show that fixed carbon con- tent has little influence on specific surface area, pore volume, and pore size distribution when fixed carbon content is in the range of 70.17% -88.34%. When fixed carbon content changes from 88.34% to 94.45% , coal specific surface area and mieropore volume increases 1.84 and 5.06 times respectively, and the pore size distribution moves to micro- pore. Methane adsorption capacity follows a U shape second-order polynomial trend with fixed carbon content.
Keywords：fixed carbonsurface morphologytextural charactermethaneLangmuir volume
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 1477-1482 )