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Interactions of amino acids with H-ZSM-5 zeolite: An embedded ONIOM study

✍ Scribed by Bundet Boekfa; Piboon Pantu; Jumras Limtrakul


Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
857 KB
Volume
889
Category
Article
ISSN
0022-2860

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Proton magic-angle-spinning nuclear magnetic resonance <lH MAS NMR) spectroscopy may yield quantitative information about Brbnsted acid sites, the extent of structural defects and non-framework species in the intra-zeolitic channels. We show that the extremely high concentration of silanol groups in

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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