AI Article Synopsis
- Hydrogen adsorption was measured on Al-, Cr-, and Zn-based metal-organic frameworks (MOFs) and single-walled carbon nanotubes (SWNTs) at temperatures from 77 to 300 K and pressures up to 50 atm using a volumetric method.
- Maximum hydrogen adsorption at 77 K reached 2.3 to 3.9 wt % for MOFs and 1.5 to 2.5 wt % for SWNTs, both at pressures below 40 atm, while at room temperature, adsorption was significantly lower (<0.4 wt %).
- A Dubinin-Astakhov approach was employed to analyze the adsorption data, revealing average adsorption enthalpies of approximately 2.9 kJ
Article Abstract
Hydrogen adsorption measurements on Al-, Cr-, and Zn-based metal-organic frameworks (MOFs) and single-walled carbon nanotubes (SWNTs) are presented. The measurements were performed at temperatures ranging from 77 to 300 K and pressures up to 50 atm using a volumetric approach. The maximum excess adsorption at 77 K ranges from 2.3 to 3.9 wt % for the MOFs and from 1.5 to 2.5 wt % for the SWNTs. These values are reached at pressures below 40 atm. At room temperature and 40 atm, modest amounts of hydrogen are adsorbed (<0.4 wt %). A Dubinin-Astakhov (DA) approach is used to investigate the measured adsorption isotherms and to retrieve energetic and structural parameters. The adsorption enthalpy averaged over filling is about 2.9 kJ/mol for the MOF-5 and about 3.6-4.2 kJ/mol for SWNTs.
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| http://dx.doi.org/10.1021/la061149c | DOI Listing |
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