H₂ and CH₄ Sorption on Cu-BTC Metal Organic Frameworks at Pressures up to 15 MPa and Temperatures between 273 and 318 K

Yves Gensterblum

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DOI: 10.4236/jsemat.2011.12004                

Abstract

Sorption isotherms of methane and hydrogen on Cu₃(BTC)₂ have been measured in the temperature range from 273 to 318 K and at pressures up to 15 MPa. H₂ excess sorption capacities of the Cu₃(BTC)₂ amounted to 3.9 mg/g at 14 MPa. Promising maximum CH₄ excess sorption capacities on the same sample were reached at approximately 5 MPa. They amounted to 101, 100, 92 and 80 mg/g at 273, 278, 293 and 318 K, respectively. The sorbed phase density was essestially the same for all temperatures and amounted to ~600 kg/m³. Structural changes of the Cu₃(BTC)₂ samples after thermal activation and treatment with high pressure H₂ and CH₄ were tested. It was found that the initial micropore structure has virtually disappeared as evidenced by a decrease of the Langmuir specific surface area by a factor ~3 and CO₂ micropore volume by a factor of ~4 for H₂ and ~3 for CH₄. This is in line with an increase in the average pore diameter from initially 9.2 to 15.7 for H₂ and 12.8 for CH₄.

Keywords

Metal Organic Framework (MOF), Sorption, Methane, Hydrogen, Pore Structure

Conflicts of Interest

The authors declare no conflicts of interest.

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