Corresponding states interpretation of adsorption in gate-opening metal-organic framework Cu(dhbc)2(4,4′-bpy)

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:446

Article

Sircar, Sarmishtha¹  Pramanik, Sanhita²  Li, Jing²  Cole, Milton W.³  Lueking, Angela D.^1,4 

[1] Penn State Univ, Dept Energy & Mineral Engn, University Pk, PA 16802 USA

[2] Rutgers State Univ, Dept Chem & Chem Biol, Piscataway, NJ 08854 USA

[3] Penn State Univ, Dept Phys, University Pk, PA 16802 USA

[4] Penn State Univ, EMS Energy Inst, Dept Chem Engn, University Pk, PA 16802 USA

关键词: Adsorption;    Gas separations;    Gas storage;    Porous coordination polymers;   

DOI  :  10.1016/j.jcis.2015.01.011

来源: Elsevier

【 摘 要 】

The universal adsorption theory (UAT) extends the principle of corresponding states for gas compressibility to describe the excess density of an adsorbed phase at comparable reduced conditions. The UAT helps to describe experimental trends and provide predictive capacity for extrapolation from one adsorption isotherm to that of a different adsorbate. Here, we extend the UAT to a flexible metal-organic framework (MOF) as a function of adsorbate, temperature, and pressure. When considered via the UAT, the adsorption capacity and GO pressure of multiple gases to Cu(dhbc)(2)(4,4'-bPY) [H(2)dhbc = 2,5-dihydroxybenzoic acid, bpy = bipyridine] show quantifiable trends over a considerable temperature and pressure range, despite the chemical and structural heterogeneity of the adsorbent. Exceptions include quantum gases (such as H-2) and prediction of maximum capacity for large and/or polar adsorbates. A method to derive the heat of gate opening and heat of expansion from experimental trends is also presented, and the parameters can be treated as separable and independent over the temperature and pressure range studied. We demonstrate the relationship between the UAT and the common Dubinin analysis, which was not previously noted. (C) 2015 Elsevier Inc. All rights reserved.

【 授权许可】

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