Formation of NH4+ at the Brønsted site in SAPO catalysts
✍ Scribed by Jumras Limtrakul; Jarungsak Yoinuan
- Book ID
- 103666783
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 523 KB
- Volume
- 184
- Category
- Article
- ISSN
- 0301-0104
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📜 SIMILAR VOLUMES
A new structure for the surface complex of water on bridged hydroxyl sites is proposed which is stabilized by two hydrogen bonds. The energy for the formation of a surface hydronium ion is estimated to be 0.5f 20 kJ/mol. Tbis conclusion is based on quantum-chemical ab initio SCF calculations (DZP ba
H 2'AI and %i solid-state NMR was used to determine the geometry of the Brsnsted acid site in zeolites. The mean distance between acidic protons in bridging hydroxyl groups and the nearest framework Al atom is 2.38 ? 0.04 8, in zeolite H-Y and 2.48 2 0.04 A in H-ZSM-5. The quadrupole frequency of fr