以重庆烟煤为原料,采用碳化-活化-气相沉积工艺制备了变压吸附(PSA)浓缩CH_4/N_2中CH_4用的成型活性炭,考察了制备工艺条件对活性炭浓缩CH_4/N_2中CH_4效果的影响.用低温液氮吸附方法对活性炭的孔结构进行了表征.实验结果表明,制备的成型活性炭在单循环五步PSA过程的抽真空步骤可使CH_4的浓度较原料气提高20.0%(体积分数)左右.对浓缩效果为20%(体积分数)的AC-1活性炭进行了表征,其BET比表面积为580m~2/g,微孔孔容为0.14cm~3/g,孔径分布主要集中在2.0～4.0nm.
Shaped active carbon adsorbents using bituminous coal from Chonqing mine as raw material for concentrating methane from CH_4/N_2 mixtures were prepared by taking carbonization-activation-deposition process and the effect of the preparation conditions on the pressure swing adsorption (PSA) concentrating performance was studied.The micro-structure characterization of active carbon was investigated by low temperature liquid nitrogen adsorption method.Experimental results showed that the methane concentration had increased 20.0vol% at the vacuum stage of PSA process with five steps using the shaped active carbon prepared as absorbent.As for one of the shaped active carbon adsorbents which concentrating effect was 20vol%,its BET specific surface area was 580m~2/g,total micropore volume was 0.14cm~3/g and its pore diameter size distribution was mostly between 2.0 and 4.0nm.
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