Lei Lei,Yan Cheng,Changwei Chen,Mohammadreza Kosari,Zeyu Jiang,Chi He
Though the highest CO 2 capture capacity belongs to liquid amine-solutions, solid matters capable of CO 2 capture are also highly sought, providing that, they offer at least analogous CO 2 adsorption capacity and CO 2 /N 2 selectivity. Herein, a surprisingly high-performance Ni-based metal–organic framework for CO 2 adsorption, namely MOF-74(Ni), was synthesized by a facile condensation reflux approach. It was found that the structure and CO 2 adsorption isosteric heat of MOF-74(Ni) could tune upon varying the synthesis duration under various temperatures. The optimized MOF-74(Ni)-24-140 (synthesized at 140 °C for 24 h) displays outstanding CO 2 adsorption capacity of 8.29/6.61 mmol/g at 273/298 K under normal pressure of 1.0 bar, several times higher than previously reported MOF-74-Ni (2.0/2.1 times), UTSA-16 (1.5/1.6 times), and DA-CMP-1 (3.6/4.9 times) under similar conditions. The excellent CO 2 capture capacity is associated to the abundant adsorption sites (mainly arising from the cationic Ni 2+ ions) and narrow micropore channels (mainly arising from the cage structure of Ni 2+ ions coordinated with organic linkers). Offering a high CO 2 selectivity (CO 2 /N 2 = 49) and a well-tuned isosteric heat of CO 2 adsorption (27–52 kJ/mol) besides its decent CO 2 capture capacity, MOF-74(Ni) strongly stands out as an efficient and strong CO 2 capturing material with industrial scale applicability.
Sa Wang,Yufan Zhang,Yuning Tang,Yijing Wen,Zhenqiang Lv,Sihao Liu,Xiang Li,Xin Zhou
Separating propane from propylene is a significant challenge in petrochemical industry. Rational chemistry design of the propane-selective adsorbent has not been reported. This work demonstrates the first design of propane-selective adsorbents. Two strategies based on surface chemistry tuning, namely compositing 2D g-C 3 N 4 and replacing ligand, have been proposed to yield the propane-selective g-C 3 N 4 @Zr-BPDC (BPDC = biphenyl-4,4′-dicarboxylate) and Zr-BPYDC (2,2′-bipyridine 5,5′-dicarboxylate). Whereas g-C 3 N 4 @Zr-BPDC has a high propane capacity of 8.79 mmol/g at room temperature and ambient pressure, Zr-BPYDC exhibits superior propane/propylene selectivity. The isosteric heat of propane and propylene adsorption on both adsorbents is lower than that of most reported adsorbents, indicating facile regeneration of the adsorbents. DFT calculations suggest the propane-selectivity comes from multiple C H δ+ ⋯N δ− interactions between propane and nitrogen atoms of the adsorbents. Moreover, both adsorbents produce polymer-grade propylene through a one-step separation using a packed column, facilitating the energy-effective production of polymer grade propylene under ambient conditions.
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