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Hydrogen adsorption on metal-organic framework (MOF-5) synthesized by DMF approach

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Abstract

Metal-organic frameworks (MOFs), especially MOF-5, are believed to be promising new porous materials for hydrogen adsorption. A comparative study of material synthesis, characterization and hydrogen adsorption was performed to examine the effects of different synthesis conditions on crystal structure, pore textural property and hydrogen adsorption performance of MOF-5 materials. Three MOF-5 samples synthesized with dimethyl formamide (DFM) as solvent and slightly different procedures have shown similar phase structure and chemical composition, diverse crystal structures, varying pore textural properties and different hydrogen adsorption performance. It was established from the experimental results that higher order of crystallinity in the MOF-5 materials generates better adsorbents with larger crystal size, higher specific surface area, uniform pore size distribution (PSD), larger hydrogen adsorption capacity and faster hydrogen diffusion rate in MOF-5 adsorbents. The best MOF-5 sample synthesized in this work (MOF-5(γ)) has a Langmuir specific surface area of 1157 m2/g; it can adsorb 0.5 wt.% of hydrogen at 77 K and 800 mmHg; and results in hydrogen diffusivity inside MOF-5 crystal of 2.3 × 10−9 cm2/s. The density functional theory reasonably predicts the presence of mesopores and macropores in all three MOF-5 samples synthesized in this work.

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Abbreviations

a m :

Langmuir equation constant (wt.%)

b :

Langmuir equation constant (mmHg−1)

d c :

Diameter of single crystal of MOF-5 (cm)

D c :

Intracrystalline diffusivity (cm2/s)

k :

Freundlich equation constant

m t :

Adsorbed amount per unit mass of adsorbent at time t (wt.%)

m ∞, m max :

Maximum adsorbed amount per unit mass of adsorbent at t = ∞ (wt.%)

n :

Freundlich equation constant

p, P :

Pressure (mmHg)

P 0 :

Gas saturation pressure at temperature T (mmHg)

q :

Adsorbate concentration in the adsorbent (wt.%)

\( \overline{q} \) :

Average adsorbate concentration in the adsorbent particle (wt.%)

\( q^{'}_{0} \) :

Initial adsorbate concentration in the adsorbent particle (wt.%)

r :

Radius of particle

r c :

Radius of single crystal of MOF-5 (cm)

t :

Time (s)

T :

Absolute temperature (K)

V :

Volume

F :

Helmholtz free energy

N :

Number of molecules

W :

Pore width

ρ(r):

Local density of adsorbate at pore radius r of adsorbent

Ω[ρ(r)]:

Grand potential or grand free energy

μ:

Chemical potential

\( V_{{{\text{ext}}}} (r) \) :

External potential imposed by adsorbent pore wall at a radius r

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Acknowledgement

This work was supported by US Army Research Office through grant W911NF-06-1-0200.

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Authors and Affiliations

  1. Department of Chemical Engineering, New Mexico State University, MSC 3805, P.O. Box 30001, Las Cruces, NM, 88003, USA

    Dipendu Saha, Shuguang Deng & Zhiguan Yang

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  1. Dipendu Saha
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  2. Shuguang Deng
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  3. Zhiguan Yang
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Correspondence to Shuguang Deng.

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Saha, D., Deng, S. & Yang, Z. Hydrogen adsorption on metal-organic framework (MOF-5) synthesized by DMF approach. J Porous Mater 16, 141–149 (2009). https://doi.org/10.1007/s10934-007-9178-3

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  • DOI: https://doi.org/10.1007/s10934-007-9178-3

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