活性炭是应用在变压吸附分离CO2工艺中的常用吸附剂,而工业废气中一般都含有一定量的饱和水蒸气.通过吸附等温线和穿透曲线分别研究了单/双组份的CO2和H2O在活性炭上的吸附平衡和吸附动力学.结果表明,活性炭对二氧化碳具有较高的吸附量,并具有较好的CO2/N2吸附选择性.由于吸水官能团的存在,活性炭在较高分压下表现出较大的水蒸气吸附量.不过由于吸附机理不同,水蒸气在活性炭上的吸附几乎不会影响活性炭对CO2的吸附.动力学研究表明,CO2在活性炭上的吸附速率远大于H2O的吸附速率.%Activated carbon is well applied in pressure swing adsorption process for CO2 capture. The real flue gas contains saturated water vapor as well. In this study, single and binary components adsorption equilibrium and kinetics of H2O/CO2 were studied according to their adsorption isotherms and breakthrough curves. Results showed that activated carbon could adsorb high amount of CO2 and low amount of N2, that showed a good CO2/N2 selectivity. As activated carbon contains the functional groups, the activated carbon can adsorb large amount water at high water partial pressure. However, because of different CO2 adsorption mechanism, water adsorption has almost no impact on CO2 adsorption on activated carbon. The kinetics study showed that CO2 adsorption velocity on activated carbon is much faster than that of H2O.
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