Abstract: Granular activated carbon (GAC) was prepared by preoxidation-carbonization-vapor activation process using anthracite as raw material. The adsorption isotherms of CH4, N2 and CH4/N2 mixture were measured and the pore size distribution, surface functional group and crystal structure of GAC characterized. The results show that by a pressure swing adsorption process using single column and single cycle with the prepared GAC as adsorbent, the volume percentage of CH4 was increased by 30.7% maximally. The effective micropores for separation of CH4/N2 mixture occupied a great proportion. The oxygen-containing function groups on the surface of GAC were favorable for the separation of CH4/N2. The adsorption selective coefficient of CH4 on GAC was 3.4.

Key words: activated carbon, anthracite, CH4/N2, pressure swing adsorption, separation

摘要： 以无烟煤为原料，采用预氧化-炭化-水蒸气活化法制备颗粒活性炭，用其变压吸附分离CH4/N2，以重量法测定了298 K下N2和CH4单组分及双组分气体在活性炭上的等温吸附曲线，并对活性炭的结构和表面性质进行了表征. 结果表明，以所制活性炭为吸附剂，采用单柱单循环变压吸附过程可将CH4/N2中CH4浓度最高提升30.7%(j). 所制活性炭孔结构以微孔为主且表面具有较多含氧官能团，对CH4/N2的分离效果较好，吸附选择性系数达3.4.

关键词: 活性炭, 无烟煤, CH4/N2, 变压吸附, 分离