LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal.
Int J Mol Sci. 2024 Sep 15;25(18):9951. doi: 10.3390/ijms25189951.
Metal-organic frameworks (MOFs) are promising materials for processes such as carbon dioxide (CO) capture or its storage. In this work, the adsorption of CO and nitrogen (N) in Co(ndc)(dabco) MOF (ndc: 2,6-naphthalenedicarboxylate; dabco: 1,4-diazabicyclo[2.2.2]octane) is reported for the first time over the temperature range of 273-323 K and up to 35 bar. The adsorption isotherms are successfully described using the Langmuir isotherm model. The heats of adsorption for CO and N, determined through the Clausius-Clapeyron equation, are 20-27 kJ/mol and 10-11 kJ/mol, respectively. The impact of using pressure and/or temperature swings on the CO working capacity is evaluated. If a flue gas with 15% CO is fed at 6 bar and 303 K and regenerated at 1 bar and 373 K, 1.58 moles of CO can be captured per kg of MOF. The analysis of the multicomponent adsorption of typical flue gas streams (15% CO balanced with N), using the ideal adsorbed solution theory (IAST), shows that at 1 bar and 303 K, the CO/N selectivity is 11.5. In summary, this work reports essential data for the design of adsorption-based processes for CO capture using a Co(ndc)(dabco) MOF, such as pressure swing adsorption (PSA).
金属-有机骨架（MOFs）是一种很有前途的材料，可用于二氧化碳（CO）捕获或储存等过程。在这项工作中，首次报道了 Co(ndc)(dabco) MOF（ndc：2,6-萘二甲酸；dabco：1,4-二氮杂双环[2.2.2]辛烷）中 CO 和氮气（N）的吸附，温度范围为 273-323 K，压力高达 35 bar。使用朗缪尔等温线模型成功地描述了吸附等温线。通过克劳修斯-克拉佩龙方程确定的 CO 和 N 的吸附热分别为 20-27 kJ/mol 和 10-11 kJ/mol。评估了压力和/或温度波动对 CO 工作容量的影响。如果在 6 bar 和 303 K 下进料含有 15% CO 的烟道气，并在 1 bar 和 373 K 下再生，那么每公斤 MOF 可以捕获 1.58 摩尔的 CO。使用理想吸附溶液理论（IAST）对典型烟道气混合物（15% CO 与 N 平衡）的多组分吸附进行分析表明，在 1 bar 和 303 K 下，CO/N 选择性为 11.5。总之，这项工作为使用 Co(ndc)(dabco) MOF 进行基于吸附的 CO 捕获设计提供了必要的数据，例如变压吸附（PSA）。
