Study by solid-state NMR of /sup 133/Cs and /sup 1/H of a hydrated and dehydrated cesium mordenite
The solid-state NMR of /sup 133/Cs and /sup 1/H in Cs-exchanged mordenite has been monitored as a function of dehydration of the zeolite. In the fully hydrated mordenite, /sup 133/Cs(I=7/2) exhibits a single line 64 ppm upfield of aqueous saturated CsCl. The anhydrous sample exhibits two major lines of intensities 3:1 with center of mass at -57 and -190 ppm, respectively, for Cs under magic-angle spinning. The major intensity is upfield of the line observed in the hydrated sample. The electric field gradient parameters for Cs of the anhydrous sample are e/sup 2/qQ = 3.1 MHz and eta = 0.65, which reduced to e/sup 2/qQ = 210 kHz and eta = 0 for the hydrated sample. Assignment for the three sites occupied by Cs in the anhydrous sample and the corresponding chemical shifts are site II, -157 ppm; site IV, -186 ppm; and site VI, -24 ppm after correction for the second-order quadrupolar shift. The static proton spectra decrease in intensity by a factor of 35 between the fully hydrated and anhydrous sample. While maintaining a roughly constant width of 6.6 kHz, the shape of the proton line changes with dehydration and exhibits an anisotropy in the anhydrous sample.
- Research Organization:
- Iowa State Univ., Ames
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6389042
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 91:13
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CESIUM COMPOUNDS
DEHYDRATION
NMR SPECTRA
MORDENITE
CESIUM 133
CHEMICAL SHIFT
COUPLING CONSTANTS
EXPERIMENTAL DATA
HYDRATES
HYDROGEN 1
NUCLEAR MAGNETIC RESONANCE
SOLIDS
ALKALI METAL COMPOUNDS
ALKALI METAL ISOTOPES
CESIUM ISOTOPES
DATA
HYDROGEN ISOTOPES
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MATERIALS
MINERALS
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
RESONANCE
SILICATE MINERALS
SPECTRA
STABLE ISOTOPES
ZEOLITES
400201* - Chemical & Physicochemical Properties