中文摘要：

主要研究了MOF-74（Ni）材料对CO/N2/CO2的吸附分离性能。应用水热法合成制备MOF-74（Ni），分别采用全自动表面积吸附仪、P-XRD、扫描电子显微镜对材料的孔隙结构和晶体形貌进行了表征，应用静态吸附法测定了CO、N2和CO2在MOF-74（Ni）上的吸附等温线，应用DSLF方程模拟了3种气体MOF-74（Ni）上的吸附等温线，依据IAST理论模型计算了MOF-74（Ni）对CO/N2二元混合物和CO/CO2二元混合物的吸附选择性。研究结果表明：在0.1 MPa和常温条件下，MOF-74（Ni）材料对CO吸附容量高达6.15 mmol·g-1，而相同条件下N2的吸附量只有0.86 mmol·g-1。MOF-74（Ni）在低压下（0～40 kPa）对CO的吸附量明显高于其对CO2的吸附量。应用IAST模型估算MOF-74（Ni）对二元混合物吸附选择性的结果表明：MOF-74（Ni）对CO/N2混合物的吸附选择性在1000以上；MOF-74（Ni）对 CO/CO2的吸附选择性在4～9范围，在所研究的二元气体混合物吸附体系中，MOF-74（Ni）都能优先吸附CO。

英文摘要：

This work investigates the adsorption performance of adsorbent MOF-74（Ni） for CO/N2 and CO2/CO2 binary gas mixtures. Adsorbent MOF-74（Ni） with high density of coordinatively unsaturated sites was synthesized by a hydrothermal method, and characterized with N2 adsorption, P-XRD, and SEM. The adsorption isotherms of CO, N2 and CO2 on MOF-74（Ni） were measured, and the selectivities for CO/N2 and CO/CO2 were calculated based on ideal adsorbed solution theory （IAST）. Results showed that adsorbent MOF-74（Ni） achieved superior CO adsorption capacity of 6.15 mmol·g-1 at 298 K and 0.1 MPa, and as low as 0.86 mmol·g-1 for N2. In low pressure range of 0—40 kPa, MOF-74（Ni） showed significantly higher uptake for CO than that for CO2. Moreover, IAST-predicted CO/N2 selectivity of MOF-74（Ni） is above 1000, and its CO/CO2 selectivity is in the range of 4—9. It suggests that MOF-74（Ni） is more favorable for CO adsorption than N2and CO2 adsorption.