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Hydrogen storage in metal‐organic and covalent‐organic frameworks by spillover
Author(s) -
Li Yingwei,
Yang Ralph T.
Publication year - 2008
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.11362
Subject(s) - hydrogen storage , adsorption , covalent organic framework , hydrogen spillover , volume (thermodynamics) , hydrogen , metal organic framework , chemical engineering , langmuir , spillover effect , chemistry , specific surface area , materials science , inorganic chemistry , covalent bond , thermodynamics , organic chemistry , catalysis , physics , engineering , economics , microeconomics
Covalent‐organic framework COF‐1 and metal‐organic frameworks HKUST‐1 and MIL‐101 were synthesized and studied for hydrogen storage at 77 and 298 K. Although MIL‐101 had the largest surface area and pore volume among the three materials, HKUST‐1 had the highest uptake (2.28 wt %) at 77 K. However, the H 2 storage capacity at 298 K and high pressure correlated with the surface area and pore volume. The H 2 storage in the COF and MOF materials assisted by hydrogen spillover, measured at 298 K up to a pressure of 10 MPa, have been examined for correlations with their structural and surface features for the first time. By using our simple technique to build carbon bridges, the hydrogen uptakes at 298 K were enhanced significantly by a factor of 2.6–3.2. The net uptake by spillover was correlated to the heat of adsorption through the Langmuir constant. Results on water vapor adsorption at 298 K indicated that COF‐1 was unstable in moist air, while HKUST‐1 and MIL‐101 were stable. The results suggested that MIL‐101 could be a promising material for hydrogen storage because of its high heat of adsorption for spiltover hydrogen, large surface area and pore volume, and stability upon H 2 O adsorption. © 2007 American Institute of Chemical Engineers AIChE J, 2008