sup 29 Si magic angle spinning NMR spectra of alkali metal, alkaline earth metal, and rare earth metal ion exchanged Y zeolites

Journal Article · Thu Feb 23 00:00:00 EST 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100341a045· OSTI ID:5113347

Chao, Kueijung; Chern, Jeryoung ^[1]

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1. Tsinghua Univ., Taiwan (China)

The variation of the extraframework cation location in groups IA and IIA metals and rare earth metal (RE) Y zeolites as a function of the dehydration and the rehydration is monitored by {sup 29}Si MAS NMR. Unheated hydrated zeolites give similar {sup 29}Si spectra as they present the similar cation distributions. Upon dehydration a high-field shift is observed which correlates with the distortion of bond angles in silicon-oxygen tetrahedra. The line shapes of {sup 29}Si spectra depend on the nature and the location of the exchangeable cations and the occupancy of the different sites in dehydrated and rehydrated states. The correlation between the line shape of {sup 29}Si spectra and the migration of cations from the supercages to the sodalite cages after heating treatment was studied. The results of {sup 29}Si NMR agree with the known structure data.

• OSTI ID: 5113347
• Journal Information: Journal of Physical Chemistry; (USA), Vol. 93:4; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BARIUM
CHEMICAL SHIFT
CALCIUM
CERIUM
LANTHANUM
POTASSIUM
SODIUM
STRONTIUM
YTTRIUM
EXPERIMENTAL DATA
HYDRATES
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
QUANTITY RATIO
SILICON 29
ZEOLITES
ALKALI METALS
ALKALINE EARTH METALS
DATA
ELEMENTS
EVEN-ODD NUCLEI
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MATERIALS
METALS
MINERALS
NUCLEI
NUMERICAL DATA
RARE EARTHS
RESONANCE
SILICON ISOTOPES
SPECTRA
STABLE ISOTOPES
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties