Low-temperature (144 K) sup 129 Xe NMR of amorphous materials: Effects of pore size distribution on chemical shift
- Phillips Petroleum Co., Bartlesville, OK (USA)
{sup 129}Xe nuclear magnetic resonance (NMR) spectra of xenon adsorbed on amorphous silica, alumina, and silica-alumina have been measured as a function of the xenon loading at 144 K. At low xenon loadings, the {sup 129}Xe chemical shift shows a nonlinear dependence on the xenon loading. In the amorphous alumina and silica-alumina, a parabolic-like curvature in the chemical shift similar to that observed in Y zeolites with (+2) cations is observed even though the exon adsorption sites in the amorphous materials are much weaker. The nonlinear dependence of the {sup 129}Xe chemical shift on the xenon loading can be explained by the presence of a broad distribution in the micropore size and the fact that the chemical shift is an inverse function of the micropore size.
- OSTI ID:
- 7021370
- Journal Information:
- Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:22; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104 -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINATES
ALUMINIUM COMPOUNDS
AMORPHOUS STATE
DATA
DATA ANALYSIS
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GASES
INFORMATION
LOW TEMPERATURE
MAGNETIC RESONANCE
MEASURING INSTRUMENTS
MEASURING METHODS
NONMETALS
NUCLEAR MAGNETIC RESONANCE
NUMERICAL DATA
OXYGEN COMPOUNDS
RARE GASES
RESONANCE
XENON