Highly Selective Carbon Dioxide Sorption in an Organic Molecular Porous Material

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• 作者：Hyunuk Kim ; Yonghwi Kim ; Minyoung Yoon ; Soyoung Lim ; Se Min Park ; Gon Seo ; Kimoon Kim
• 刊名：Journal of the American Chemical Society
• 出版年：2010
• 出版时间：September 8, 2010
• 年：2010
• 卷：132
• 期：35
• 页码：12200-12202
• 全文大小：171K
• 年卷期：v.132,no.35(September 8, 2010)
• ISSN：1520-5126

文摘

The organic molecular porous material 1 obtained by recrystallization of cucurbit[6]uril (CB[6]) from HCl shows a high CO₂ sorption capacity at 298 K, 1 bar. Most interestingly, 1 showed the highest selectivity of CO₂ over CO among the known porous materials so far. The remarkable selectivity of CO₂ may be attributed to the exceptionally high enthalpy of adsorption (33.0 kJ/mol). X-ray crystal structure analysis of CO₂ adsorbed 1 revealed three independent CO₂ sorption sites: two in the 1D channels (A and B) and one in the molecular cavities (C). The CO₂ molecules adsorbed at sorption site A near the wall of the 1D channels interact with 1 through hydrogen bonding and at the same time interact with those at site B mainly through quadrupole−quadrupole interaction in a T-shaped arrangement. Interestingly, two CO₂ molecules are included in the CB[6] cavity (site C), interacting not only with the carbonyl groups of CB[6] but also with each other in a slipped-parallel geometry. The exceptionally selective CO₂ sorption properties of 1 may find useful applications in the pressure swing adsorption (PSA) process for CO₂ separation not only in the steel industry but also in other industries such as natural gas mining.