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Hydrogen Adsorption in MOF-74 Studied by Inelastic Neutron Scattering

Published online by Cambridge University Press:  01 February 2011

Yun Liu ,
Craig M. Brown ,
Dan A. Neumann ,
Houria Kabbour  and
Channing C. Ahn
Yun Liu
Affiliation:
yunliu@nist.gov, National Institute of Standards and Technology, Center for Neutron Research, 100 Bureau Drive, MS6102, Gaithersburg, MD, 20899, United States, 301-975-6235
Craig M. Brown
Affiliation:
craigy@nist.gov, NIST Center for Neutron Research, 100 Bureau Drive, MS6102, Gaithersburg, MD, 20899, United States
Dan A. Neumann
Affiliation:
dan@nist.gov, NIST Center for Neutron Research, 100 Bureau Drive, MS6102, Gaithersburg, MD, 20899, United States
Houria Kabbour
Affiliation:
kabbour@caltech.edu, California Institute of Technology, Division of Engineering and Applied Science, Pasadena, CA, 91125, United States
Channing C. Ahn
Affiliation:
cca@caltech.edu, California Institute of Technology, Division of Engineering and Applied Science, Pasadena, CA, 91125, United States
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Abstract

Adsorption of hydrogen and the occupancy of different binding sites as a function of hydrogen loading in MOF-74 are studied using inelastic neutron scattering (INS). Hydrogen molecules are observed to fully occupy the strongest binding site before populating other adsorption sites. The comparison of the INS spectra at 4 K and 60 K indicates that hydrogen adsorbed at the strongest binding site is strongly bound and localized. We also show that when two hydrogen molecules are adsorbed into a single, attractive potential well, the shortest inter-H2 distance is about 3 Å, consistent with our previous observation of inter-H2 distance when adsorbed in two neighboring potential wells.

Keywords

storageneutron scatteringadsorption
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1041: Symposium R – Life-Cycle Analysis for New Energy Conversion and Storage Systems , 2007 , 1041-R02-03
Copyright
Copyright © Materials Research Society 2008

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