Temperature Dependence of Nuclear Magnetic Resonance Chemical Shifts of 129Xe in the α-Cages of NaY Zeolite

• Published in: The journal of physical chemistry. B Vol. 103; no. 21; pp. 4323 - 4329
• Main Authors: Labouriau, Andrea, Pietrass, Tanja, Weber, William A, Gates, Bruce C, Earl, William L
• Format: Journal Article
• Language: English
• Published: American Chemical Society 27.05.1999
• ISSN: 1520-6106; 1520-5207
• DOI: 10.1021/jp9846835

One- and two-dimensional NMR spectra of 129Xe sorbed in NaY zeolite at a loading of approximately 1 Xe atom/4 α-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 α-cages and at the lower temperatures, near the cage walls.