Competitive adsorption of xenon and argon in zeolite NaA. 129Xe nuclear magnetic resonance studies and grand canonical Monte Carlo simulations

Autor:	Cynthia J. Jameson, Hyung-Mi Lim, A. Keith Jameson
Rok vydání:	1996
Předmět:	Argon Chemical shift Krypton General Physics and Astronomy chemistry.chemical_element Nuclear magnetic resonance spectroscopy Spectral line NMR spectra database Nuclear magnetic resonance Xenon chemistry Physics::Atomic and Molecular Clusters Cluster (physics) Physical and Theoretical Chemistry
Zdroj:	The Journal of Chemical Physics. 104:1709-1728
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.470757
Popis:	Investigation of competitive adsorption is carried out using the Xe–Ar mixture in zeolite NaA as a model system. The Xen clusters are trapped in the alpha cages of this zeolite for times sufficiently long that it is possible to observe individual peaks in the NMR spectrum for each cluster while the Ar atoms are in fast exchange between the cages and also with the gas outside. The 129Xe nuclear magnetic resonance spectra of 12 samples of varying Xe and Ar loadings have been observed and analyzed to obtain the 129Xe chemical shifts and the intensities of the peaks which are dependent on the average argon and xenon occupancies. The detailed distributions, f(XenArm), the fractions of cages containing n Xe atoms and m Ar atoms cannot be observed directly in this system, that is, individual peaks for XenArm mixed clusters are not observed in the NMR spectrum. This information is, however, convoluted into the observed 129Xe chemical shifts for the Xen peaks and the distributions Pn, the fraction of cages contain...
Databáze:	OpenAIRE
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