The temperature dependence of the line-shape of 1H MAS NMR spectra of H-mordenite and H-MCM-22 was examined. Upon raising the temperature of measurements stepwise from 298 to 503 K, the line-width of 1H MAS NMR of acidic protons in H-mordenite with SiO 2 /Al 2 O 3 ratio of 106 increased, went throug
Studies of proton conduction in the zeolites H-natrolite and H-mordenite
โ Scribed by M. Lal; C.M. Johnson; A.T. Howe
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- English
- Weight
- 338 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0167-2738
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๐ SIMILAR VOLUMES
Values of relative interaction energy between an isobutane molecule and the surface of the H-mordenite zeolite were obtained. Sixteen tetrahedral sites were taken into account for the surface. Results showed that the adsorption energies were 4 and 8 kJ/mol, for ab initio restricted Hartree-Fock (RHF
The Brรธnsted acidity of H-mordenite (H-MOR) and H-b with similar Si/Al ratios has been characterized by conventional multinuclear solid-state NMR. 1 H/ 27 Al TRAPDOR NMR showed the presence of at least two different types of Brรธnsted acid sites in H-b. On the other hand, only a single 1 H resonance
Broad-line 'H NMR and 'H MAS NMR were used to determine the geometry of the Bransted acidic sites in zeolites H-ZSM-5. The signals obtained correspond to bridging hydroxyl groups in Si-OH-Al arrangements with an H-Al distance of 0.246-0.252 nm. The concentration of hypothetical SiOHSi groups must be