Journal
ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
Volume 18, Issue 5-6, Pages 483-491Publisher
SPRINGER
DOI: 10.1007/s10450-012-9438-7
Keywords
MIL-101; Metal organic frameworks; Porous material; Hydrogen storage; XANES/EXAFS; Hydrogen spillover
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Funding
- National Science Council, Taiwan [NSC-94-2211-E-155-001]
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MIL-101 is a chromium-based metal organic framework known to adsorb large amount of gases such as H-2, CO2 and CH4. The framework was synthesized through solvothermal route and the H-2 adsorption capacity was measured using a standard gravimetric method. X-ray absorption spectroscopy was performed to understand the fine structure, neighbors, coordination number and bond distance. The BET specific surface area of MIL-101nf (treated with NH4F) was 2,868 m(2)/g with a type I hysteresis loop measured from N-2 adsorption isotherm. The hydrogen storage capacity was 0.16 wt% measured at 32 bar and room temperature for MIL-101nf. This capacity was increased up to 0.45 wt% by doping metal-supported carbon catalyst (Pd/AC and Pt/AC) through a carbon bridge with MIL-101. XANES spectra indicated that the valency of MIL-101 MOFs was Cr(III). EXAFS data also revealed that MIL-101 has a first shell of Cr-O bonding with the bond distance of 1.97 angstrom and the coordination number of 5.4.
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