Activated carbon (AC) based adsorbents having high and stable CO₂ adsorption capacity with enhanced CO₂ selectivity in presence of CH₄ were developed. Alkali modified AC samples were prepared, their CO₂ adsorption capacities were measured, a new methodology for selective adsorption capacity determination under multicomponent gas mixture flow was developed, and the results were analyzed to determine the preparation procedure yielding optimum adsorbent design. Two groups of adsorbents were prepared by K₂CO₃ impregnation on air and HNO₃ oxidized forms of a commercial AC followed by calcination at various temperatures. The resulting adsorbents were named according to calcination temperatures as ACxK-calT. The highest CO₂ adsorption capacity was measured on AC3K-300 sample as 110 mg/g adsorbent at 1000 mbar CO₂ and 25 °C. CO₂ adsorption was confirmed reversible, whereas CH₄ adsorption was found partially irreversible. The highest mass based CO₂:CH₄ selectivity, ca. 3.7, was achieved over AC2K-200 at 25 °C for the 50%CO₂-50%CH₄ mixture. AC2K-200 was further tested at higher total pressures, for 0–5000 mbar pressure range, at 25 °C. CO₂ adsorption capacity was measured as 197 mg/g adsorbent at 5000 mbar CO₂. Among Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models, D-R was found to be the most successful one explaining CO₂ adsorption behavior of AC samples.

开发了具有高且稳定的CO ₂吸附能力且在CH ₄存在下具有增强的CO ₂选择性的基于活性炭（AC）的吸附剂。制备了碱改性AC样品，测量了它们的CO ₂吸附容量，开发了一种在多组分气体混合物流量下选择性吸附容量测定的新方法，并对结果进行了分析，以确定了制备最佳吸附剂设计的程序。空气和HNO ₃浸渍K ₂ CO ₃制备两组吸附剂氧化形式的商用AC，然后在各种温度下煅烧。根据煅烧温度将所得的吸附剂命名为AC × K-calT。在AC3K-300样品上，在1000 mbar CO ₂和25°C下以110 mg / g的吸附剂测量到最高的CO ₂吸附容量。确认CO ₂吸附是可逆的，而发现CH ₄吸附部分不可逆。最高的基于质量的CO ₂：CH ₄选择性，ca。对于50％CO ₂ -50％CH ₄混合物，在25°C下通过AC2K-200达到3.7 。AC2K-200在25°C下在0–5000 mbar压力范围内的更高总压力下进行了进一步测试。一氧化碳₂吸附容量测量为197毫克/克吸附剂在5000毫巴CO ₂。在Langmuir，Freundlich和Dubinin-Radushkevich（DR）等温模型中，DR是最成功的一种解释AC样品对CO ₂吸附行为的模型。