Surface modification of coal-based activated carbon and its effects on methane adsorption
Abstract：The role of oxygen functional groups in the methane adsorption over the coal-based activated carbon（AC） was studied.The AC was modified by different chemical treatments,and characterized by Boehm titration,TPD-MS and nitrogen adsorption.The results of Boehm titration show that the concentrations of acidic oxygen functional groups on the surface of activated carbon gain with modification,especially the concentration of carboxyl.The result of TPD,which was analyzed by a deconvolution method with a multiple Gaussian function,reveals the increase of oxygen groups on the AC surface after the oxidation treatments.Nitrogen adsorption indicates that the pore distribution over the AC is modified with the oxidation treatment.The methane adsorption capacity of activated carbon with oxidation treatment decreases,which was analyzed from the adsorption isotherm.Meanwhile,the pore size distribution plays a minor role in the decrease of adsorption capacity as well.
Keywords：surface modificationcoal-based activated carbonmethane adsorption capacityoxygen-containing func-tional groupsoxidation treatment
Publication Date：2011-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)