Temperature dependence of nuclear magnetic resonance chemical shifts of {sup 129}Xe in the {alpha}-cages of NaY zeolite
- Los Alamos National Laboratory, NM (United States). Chemical Science and Technology Div.
- New Mexico Inst. of Mining and Technology, Socorro, NM (United States). Dept. of Chemistry
- Univ. of California, Davis, CA (United States). Dept. of Chemical Engineering and Materials Science
One- and two-dimensional NMR spectra of {sup 129}Xe sorbed in NaY zeolite at a loading of approximately 1 Xe atom/4 {alpha}-cages were obtained as a function of temperature. One-dimensional spectra were measured over the range of 60--300 K, by far the largest range yet investigated with this method. The data were fitted to the simple statistical mechanical cylindrical pore model of Cheung yielding a van der Waals adsorption energy of 3.3 kJ/mol. 2D-NOESY spectra were obtained at 300 and 355 K. The two-dimensional data show that the intercrystalline diffusion is slow compared to intracrystalline diffusion. The results indicate that the Xe atoms spend most of their time in the {alpha}-cages and at the lower temperatures, near the cage walls.
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 351561
- Journal Information:
- Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical, Journal Name: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical Journal Issue: 21 Vol. 103; ISSN JPCBFK; ISSN 1089-5647
- Country of Publication:
- United States
- Language:
- English
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