Hydrogen adsorption equilibrium and kinetics in metal-organic framework (MOF-5) synthesized with DEF approach

Dipendu Saha, Zuojun Wei, Shuguang Deng

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

MOF-5, also known as isoreticular MOF-1 (IRMOF-1) was successfully synthesized with diethyl formamide (DEF) as a solvent using modified procedures aiming at improving its crystal structure, pore texture and ultimately the hydrogen adsorption performance. The MOF-5 adsorbent was characterized with nitrogen adsorption for pore textural properties, scanning electron microscopy for crystal structure, and XRD for phase structure. Hydrogen adsorption in MOF-5 was measured at low pressure in a volumetric unit at 77 K, 194.5 K and 298 K and at hydrogen pressure up to 120 bar and 77 K in a gravimetric adsorption unit. The MOF-5 synthesized in this work has ideal pore textural properties with a large Langmuir (3917 m2/g) and BET specific surface area (2449 m2/g), a median pore size of 8.6 Å and a pore volume of 1.39 cm3/g. The MOF-5 adsorbent synthesized in this work has a hydrogen adsorption capacity of 1.46 wt.% at 77 K and 1 bar, an excess hydrogen adsorption capacity of 6.9 wt.% at 77 K and 100 bar, and an absolute hydrogen adsorption capacity of 11.8 wt.% at 77 K and 120 bar. Hydrogen diffusivity in MOF-5 estimated from the adsorption kinetic data measured at low pressure are 2.4 × 10-5 cm2/s, 5.2 × 10-5 cm2/s and 6.0 × 10-5 cm2/s at 77 K, 194.5 K and 298 K, respectively. The activation energy for hydrogen diffusion and the isosteric heat of adsorption for hydrogen adsorption in MOF-5 are 0.8 kJ/mol and 2.2-2.6 kJ/mol, respectively.

Original languageEnglish (US)
Pages (from-to)280-287
Number of pages8
JournalSeparation and Purification Technology
Volume64
Issue number3
DOIs
StatePublished - Jan 12 2009
Externally publishedYes

Fingerprint

Hydrogen
Metals
Adsorption
Kinetics
Adsorbents
Crystal structure
formamide
Phase structure
Specific surface area
Pore size
Nitrogen
Activation energy
Textures
Scanning electron microscopy

Keywords

  • Adsorption
  • Equilibrium
  • Hydrogen
  • Kinetics
  • MOF-5

ASJC Scopus subject areas

  • Filtration and Separation
  • Analytical Chemistry

Cite this

Hydrogen adsorption equilibrium and kinetics in metal-organic framework (MOF-5) synthesized with DEF approach. / Saha, Dipendu; Wei, Zuojun; Deng, Shuguang.

In: Separation and Purification Technology, Vol. 64, No. 3, 12.01.2009, p. 280-287.

Research output: Contribution to journalArticle

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AB - MOF-5, also known as isoreticular MOF-1 (IRMOF-1) was successfully synthesized with diethyl formamide (DEF) as a solvent using modified procedures aiming at improving its crystal structure, pore texture and ultimately the hydrogen adsorption performance. The MOF-5 adsorbent was characterized with nitrogen adsorption for pore textural properties, scanning electron microscopy for crystal structure, and XRD for phase structure. Hydrogen adsorption in MOF-5 was measured at low pressure in a volumetric unit at 77 K, 194.5 K and 298 K and at hydrogen pressure up to 120 bar and 77 K in a gravimetric adsorption unit. The MOF-5 synthesized in this work has ideal pore textural properties with a large Langmuir (3917 m2/g) and BET specific surface area (2449 m2/g), a median pore size of 8.6 Å and a pore volume of 1.39 cm3/g. The MOF-5 adsorbent synthesized in this work has a hydrogen adsorption capacity of 1.46 wt.% at 77 K and 1 bar, an excess hydrogen adsorption capacity of 6.9 wt.% at 77 K and 100 bar, and an absolute hydrogen adsorption capacity of 11.8 wt.% at 77 K and 120 bar. Hydrogen diffusivity in MOF-5 estimated from the adsorption kinetic data measured at low pressure are 2.4 × 10-5 cm2/s, 5.2 × 10-5 cm2/s and 6.0 × 10-5 cm2/s at 77 K, 194.5 K and 298 K, respectively. The activation energy for hydrogen diffusion and the isosteric heat of adsorption for hydrogen adsorption in MOF-5 are 0.8 kJ/mol and 2.2-2.6 kJ/mol, respectively.

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