Multinuclear NMR studies reveal a complex acid function for zeolite beta
- Texas A M Univ, College Station, TX (United States)
Recently developed NMR methods reveal that the acid sites of zeolite Beta are complex. Variable-temperature [sup 1]H and [sup 1]H[[sup 27]Al] spin echo double-resonance magic angle spinning measurements showed that the protons associated with aluminum gave a narrow resonance at 4.5 ppm at 123 K, but upon warming to 298 K, this intensity was redistributed into a narrow resonance at 4.1 ppm and a broader resonance at 5.5 ppm. [sup 13]C shifts of adsorbed acetonitrile and acetone suggest a Bronsted acid strength intermediate between zeolites HZSM-5 and HY, as well as possible complexation with an unusual aluminum site associated with the framework that was observed by [sup 27]Al NMR. 21 refs., 4 figs.
- DOE Contract Number:
- FG03-93ER14354
- OSTI ID:
- 6492313
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 99:4; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ALUMINIUM
DATA
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MAGNETIC RESONANCE
MATERIALS
METALS
MINERALS
NUCLEAR MAGNETIC RESONANCE
NUMERICAL DATA
PH VALUE
PROTON SPECTRA
RESONANCE
SILICATE MINERALS
SPECTRA
SPIN ECHO
ZEOLITES