Tuning Pore Size in Square-Lattice Coordination Networks for Size-Selective Sieving of CO2

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• 作者：Dr. Kai-Jie Chen ; Dr. David G. Madden ; Dr. Tony Pham ; Katherine A. Forrest ; Amrit Kumar ; Dr. Qing-Yuan Yang ; Dr. Wei Xue ; Prof. Dr. Brian Space ; Dr. John J. Perry IV ; Prof. Dr. Jie-Peng Zhang ; Prof. Dr. Xiao-Ming Chen and Prof. Dr. Michael J. Zaworotko
• 刊名：Angewandte Chemie International Edition
• 出版年：2016
• 出版时间：August 22, 2016
• 年：2016
• 卷：55
• 期：35
• 页码：10268-10272
• 全文大小：2458K
• ISSN：1521-3773

文摘

Porous materials capable of selectively capturing CO₂ from flue-gases or natural gas are of interest in terms of rising atmospheric CO₂ levels and methane purification. Size-exclusive sieving of CO₂ over CH₄ and N₂ has rarely been achieved. Herein we show that a crystal engineering approach to tuning of pore-size in a coordination network, [Cu(quinoline-5-carboxyate)₂]_n (Qc-5-Cu) ena+bles ultra-high selectivity for CO₂ over N₂ (S_CN≈40 000) and CH₄ (S_CM≈3300). Qc-5-Cu-sql-β, a narrow pore polymorph of the square lattice (sql) coordination network Qc-5-Cu-sql-α, adsorbs CO₂ while excluding both CH₄ and N₂. Experimental measurements and molecular modeling validate and explain the performance. Qc-5-Cu-sql-β is stable to moisture and its separation performance is unaffected by humidity.