利用碱（NH3和KOH）改性活性炭，N2吸附法、酸碱滴定、FTIR对改性前后活性炭进行表征分析，测定低浓度含氧煤层气CH4在改性活性炭上的吸附透过曲线。结果表明，活性炭经氨水和KOH改性后，随氨水/KOH浓度的增加，改性活性炭微孔孔容先增大后降低，表面总碱量逐渐增大。其中，K-2/AC的微孔孔容最大（0.64mL/g），表面碱性基团含量较多（1.51mmol/g），对CH4的吸附量最大，单位吸附量达到7.16mL/g，较AC提高了31.4%。%Alkali modified activated carbons were prepared by treating the activated carbons (AC) with NH 3 and KOH solution, respectively, and characterized by N2 adsorption, acid-base titration and FTIR, and the adsorption breakthrough curves of CH4in low concentration of coal mine methane (CMM) over the modified activated carbons were measured. Results show that with the increase of ammonia or KOH concentration, the micropore volume of the modified activated carbons first increased and then decreased and the total basic radical amounts on the surfaces of activated carbons increased gradually. The activated carbon K-2/AC modified by KOH solution of 2% by mass had the largest micropore volume (0.64mL/g) and more basic radical (1.51mmol/g), which exhibited the largest CH4 adsorption capacity of 7.16mL/g, increasing by 31.4%compared to the AC.
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