Introduction of 蟺-Complexation into Porous Aromatic Framework for Highly Selective Adsorption of Ethylene over Ethane

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• 作者：Baiyan Li ; Yiming Zhang ; Rajamani Krishna ; Kexin Yao ; Yu Han ; Zili Wu ; Dingxuan Ma ; Zhan Shi ; Tony Pham ; Brian Space ; Jian Liu ; Praveen K. Thallapally ; Jun Liu ; Matthew Chrzanowski ; Shengqian Ma
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：June 18, 2014
• 年：2014
• 卷：136
• 期：24
• 页码：8654-8660
• 全文大小：359K
• 年卷期：v.136,no.24(June 18, 2014)
• ISSN：1520-5126

文摘

In this work, we demonstrate for the first time the introduction of 蟺-complexation into a porous aromatic framework (PAF), affording significant increase in ethylene uptake capacity, as illustrated in the context of Ag(I) ion functionalized PAF-1, PAF-1-SO₃Ag. IAST calculations using single-component-isotherm data and an equimolar ethylene/ethane ratio at 296 K reveal that PAF-1-SO₃Ag shows exceptionally high ethylene/ethane adsorption selectivity (S_ads: 27 to 125), far surpassing benchmark zeolite and any other MOF reported in literature. The formation of 蟺-complexation between ethylene molecules and Ag(I) ions in PAF-1-SO₃Ag has been evidenced by the high isosteric heats of adsorption of C₂H₄ and also proved by in situ IR spectroscopy studies. Transient breakthrough experiments, supported by simulations, indicate the feasibility of PAF-1-SO₃Ag for producing 99.95%+ pure C₂H₄ in a Pressure Swing Adsorption operation. Our work herein thus suggests a new perspective to functionalizing PAFs and other types of advanced porous materials for highly selective adsorption of ethylene over ethane.