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Title: Molecular simulations of H2 adsorption in metal-porphyrin frameworks: A potential new material evaluation

Journal Article · · Journal of Renewable and Sustainable Energy
DOI:https://doi.org/10.1063/1.3655373· OSTI ID:1564774
 [1];  [2]
  1. Univ. of Delaware, Newark, DE (United States); Univ. of Tennessee, Knoxville, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)

Path integral grand canonical Monte Carlo (PI-GCMC) simulations using standard force fields are typically carried out to calculate the adsorption of H2 in five metal-porphyrin frameworks (MPFs), a new class of metal organic framework (MOF)-type materials. These simulations are performed at 77 K and room temperature (300 K). The adsorption isotherms of H2 in IRMOF-1 and IRMOF-10 are also calculated as a comparison. All calculations indicate that all MPFs adsorbed a higher weight fraction of H2 than both IRMOF-1 and IRMOF-10, with one exception (MPF-2). The gravimetric hydrogen capacities are still well short of practical goals. The MPFs provide additional adsorption sites due to the porphyrin. A statistical mechanical lattice model predicts the adsorption well at room temperature. The prediction by this model reflected that a weight fraction of hydrogen of 6 wt. % adsorbed in pores of the size found in IRMOF-1 at ambient temperature and modest pressures required a binding energy of about 17 kJ/mole, which is consistent with other findings.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE); USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1564774
Journal Information:
Journal of Renewable and Sustainable Energy, Vol. 3, Issue 5; ISSN 1941-7012
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

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Palladium-catalyzed amination of meso-(bromophenyl)porphyrins with diamines and azamacrocycles journal January 2014