Abstract: Adsorption equilibrium isotherms of CO₂,CH₄ and N₂ on zeolite 13X-APG were measured by Rubotherm magnetic suspension balance in the pressure range of 0—500 kPa at temperatures of 293,303,333 and 363 K.The multi-site Langmuir model and Sips model were used to fit the experimental data,and the model parameters were obtained by the non-linear regression.Furthermore,the adsorption capacities of CO₂,CH₄ and N₂,as well as the separation factors of CO₂/CH₄,CO₂/N₂ and CH₄/N₂ gas mixtures on zeolite 13X-APG were compared with those on other materials reported in literature,including zeolites,activated carbon,mesoporous silica and metal-organic frameworks.The evaluation is given on the feasibility and efficiency of adsorption using 13X-APG as adsorbent to capture CH₄ from both landfill gases and CO₂ enhanced coal bed gases (CO₂/CH₄),to capture CO₂ from flue gases of coal-fired power plants,cement plants and coking plants (CO₂/N₂),and to concentrate CH₄ from coal mine gases (CH₄/N₂).

Key words: adsorption isotherms, zeolite 13X-APG, carbon dioxide, methane

摘要： 采用磁悬浮热天平测量了CO₂、CH₄与N₂在沸石13X-APG上的吸附等温线,温度为293、303、333和363 K,压力为0～500 kPa。对吸附平衡实验数据采用multi-site Langmuir模型和Sips模型进行拟合,均得到良好的拟合效果,非线性回归得到吸附热等模型参数,可为变压吸附工艺过程的开发提供基础热力学数据。将沸石13X-APG吸附分离性能与文献中报道的吸附材料(如沸石分子筛、活性炭、金属有机骨架材料和介孔硅分子筛)性能相比较。通过比较CO₂、CH₄与N₂吸附容量以及相对分离系数,探讨CO₂/CH₄(垃圾填埋气或者CO₂强化煤层甲烷回收气)体系、CO₂/N₂(燃煤电厂、水泥厂以及焦炭厂烟道气)体系以及CH₄/N₂(煤层气)体系吸附分离的高效材料,为未来二氧化碳吸附捕集和甲烷吸附回收提供基础数据。

关键词: 吸附等温线, 沸石13X-APG, 二氧化碳, 甲烷