Proton-loaded zeolites. 3. H sub 56 Y, ALPO-5, and SiO sub 2 -Y: Anhydrous HX versus aqueous HX treatment of zeolite Y
- Univ. of Toronto, Ontario (Canada)
The sorption of anhydrous HX into H{sub 56}Y, ALPO-5, and SiO{sub 2}-Y has been studied by IR, {sup 31}P and {sup 27}Al MAS-NMR spectroscopies, and powder XRD. For HX/H{sub 56}Y, one observes nonproductive protonation of the zeolite, as seen through fast room-temperature exchanges for both {alpha}- and {beta}-cage protons in DX/H{sub 56}Y. The exchange process is not an {alpha}-cage localized event. The observable process in HX/H{sub 56}Y instead involves Broensted acid site solvation of both {alpha}- and {beta}-cage protons, denoted ZOH{hor ellipsis}(X-H){sub n}. Complete solvation of acid sites in HX/H{sub 56}Y confirms that HX accesses every {alpha}-cage of the zeolite crystals, and XRD and {sup 27}Al and {sup 21}P MAS-NMR spectroscopies demonstrate that the crystallinity of the zeolite and the integrity of the zeolite framework are maintained during the HX sorption/desorption process.
- OSTI ID:
- 6306972
- Journal Information:
- Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:21; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALUMINIUM 27
ALUMINIUM ISOTOPES
COHERENT SCATTERING
DIFFRACTION
INFRARED SPECTRA
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MATERIALS
MINERALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
PHASE STUDIES
PHOSPHORUS 31
PHOSPHORUS ISOTOPES
RESONANCE
SCATTERING
SORPTIVE PROPERTIES
SPECTRA
STABLE ISOTOPES
SURFACE PROPERTIES
X-RAY DIFFRACTION
ZEOLITES