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

Sarmishtha Sircar, Sanhita Pramanik, Jing Li, Milton W. Cole, Angela D. Lueking

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

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) [H2dhbc=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 H2) 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.

Original languageEnglish
Pages (from-to)177-184
Number of pages8
JournalJournal of Colloid and Interface Science
Volume446
DOIs
Publication statusPublished - May 5 2015

Fingerprint

Metals
Adsorption
Adsorbates
Compressibility of gases
Gases
Adsorption isotherms
Extrapolation
Density (specific gravity)
Temperature
Adsorbents
Acids
Hot Temperature

Keywords

  • Adsorption
  • Gas separations
  • Gas storage
  • Porous coordination polymers

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Colloid and Surface Chemistry

Cite this

Corresponding states interpretation of adsorption in gate-opening metal-organic framework Cu(dhbc)2(4,4'-bpy). / Sircar, Sarmishtha; Pramanik, Sanhita; Li, Jing; Cole, Milton W.; Lueking, Angela D.

In: Journal of Colloid and Interface Science, Vol. 446, 05.05.2015, p. 177-184.

Research output: Contribution to journalArticle

Sircar, Sarmishtha ; Pramanik, Sanhita ; Li, Jing ; Cole, Milton W. ; Lueking, Angela D. / Corresponding states interpretation of adsorption in gate-opening metal-organic framework Cu(dhbc)2(4,4'-bpy). In: Journal of Colloid and Interface Science. 2015 ; Vol. 446. pp. 177-184.
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