Calorimetric studies of the adsorption thermodynamic properties of the very large pore molecular sieve VPI-5
✍ Scribed by J. Jänchen; H. Stach; P.J. Grobet; J.A. Martens; P.A. Jacobs
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 338 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0144-2449
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Molecular diffusion of methane and tetrafluoromethane in the microporous material VPI-5 was studied by pulsed field gradient nuclear magnetic resonance (PFG NMR) and NMR exchange experiments. The translational mobility of both molecules in VPI-5 was found to be at least two orders of magnitude small
The preparation of partially hydrated VPI-5, in which water molecules are strongly bonded to l/3 of framework Al atoms but there is no intracrystalline water, can be readily monitored in situ by rH NMR when fully hydrated samples are heated inside an NMR rotor. \*'Al and 3'P MAS NMR spectra have als