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Author Eckert, J. ♦ Nicol, J. M. ♦ Howard, J. ♦ Trouw, F. R.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CHEMISTRY ♦ MATERIALS SCIENCE ♦ HYDROGEN ♦ ADSORPTION ♦ NEUTRON SPECTRA ♦ ZEOLITES ♦ CALCIUM COMPOUNDS ♦ NEUTRON DIFFRACTION ♦ SPECTROSCOPY
Abstract The hindered rotations and vibrations of molecular hydrogen, deuterium, and deuterium hydride adsorbed into partially and fully Ca ion exchanged Na-A zeolites have been studied at low temperatures with the use of inelastic neutron scattering (INS) techniques. A loading of one molecule per supercage was used in an attempt to avoid multiple site occupancies. Nonetheless, the INS spectra of the rotational transitions of H{sub 2}, HD, and D{sub 2} clearly show that physical adsorption occurs on several different sites. Both the CaNa-A and Ca-A samples have strong rotational bands near 6 meV. On this basis, we conclude that the principal adsorption site in CaNa-A is in the vicinity of the CA{sup 2+} cation where H{sub 2} experiences a rotational barrier of about 4.3 kJ/mol. 26 refs., 4 figs., 2 tabs.
ISSN 00223654
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-06-20
Publisher Place United States
Journal Journal of Physical Chemistry
Volume Number 100
Issue Number 25


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