Adsorption of Hydrogen in Ca-Exchanged Na-A Zeolites Probed by Inelastic Neutron Scattering Spectroscopy

Autor:	F. Trouw, Jacqueline M. Nicol, Joseph Howard, Juergen Eckert
Rok vydání:	1996
Předmět:	Hydrogen Hydride Chemistry Neutron diffraction General Engineering chemistry.chemical_element Inelastic neutron scattering Crystallography Adsorption Deuterium Physical chemistry Molecule Physical and Theoretical Chemistry Spectroscopy
Zdroj:	The Journal of Physical Chemistry. 100:10646-10651
ISSN:	1541-5740 0022-3654
DOI:	10.1021/jp952982d
Popis:	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.
Databáze:	OpenAIRE
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