吸附
乙烯
选择性
化学
选择性吸附
配体(生物化学)
金属
热稳定性
无机化学
溶剂
晶体工程
晶体结构
化学工程
有机化学
催化作用
生物化学
超分子化学
受体
工程类
作者
Shao-Min Wang,Hao-Ran Liu,Su-Tao Zheng,Hao-Ling Lan,Qing-Yuan Yang,Yan-Zhen Zheng
标识
DOI:10.1016/j.seppur.2022.122378
摘要
• A family of C 2 H 6 -selective MOFs were prepared through the strategy of crystal engineering. • Co-9-ina exhibits ultra-high C 2 H 6 /C 2 H 4 selectivity of 2.69 at 100 kPa and 298 K. • Excellent thermal and chemical stability. • High purity of C 2 H 4 can be produced under ambient conditions in one step. The purification of ethylene (C 2 H 4 ) by selective adsorption of small amounts of ethane (C 2 H 6 ) is a crucial industrial process. However, most porous adsorbents prefer C 2 H 4 over C 2 H 6 due to the increase in kinetic diameter and decrease in quadrupole moment from C 2 H 4 to C 2 H 6 . The construction of ethane-selective adsorbents for ethylene purification is therefore a very challenging task. In this study, we designed and synthesized a family of C 2 H 6 -selective metal-organic framework (MOF) adsorbents, named Co-1-ina , Co-5-ina and Co-9-ina , through the strategy of crystal engineering using the same metal salt (Co 2+ ) and ligand (isonicotinic acid). Notably, the pore structures and topologies of these materials vary according to the reaction conditions. Among them, Co-9-ina has the highest C 2 H 6 adsorption capacity and C 2 H 6 /C 2 H 4 separation performance. The C 2 H 6 /C 2 H 4 selectivity of Co-9-ina at 298 K and 1 bar is astoundingly 2.69, which is greater than most C 2 H 6 -selective MOFs reported to date. The pyridine rings bind more strongly to C 2 H 6 via van der Waals interactions for ethane adsorption according to theoretical calculations and single crystal structures. The C 2 H 6 /C 2 H 4 separation performance for Co-9-ina was further validated by breakthrough studies under dynamic conditions.
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