An investigation of Brönsted acidity in gallosilicate-MFI (Ga-ZSM-5)
✍ Scribed by Robin Challoner; Robin K. Harris; Sami A.I. Barri; Michael J. Taylor
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 481 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0144-2449
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📜 SIMILAR VOLUMES
## Abstract Molecular dynamics simulation has been performed for studying the polarization and electronegativity of ethene molecules near Brönsted acidic sites in H[Al] ZSM‐5. The result shows that the molecules are polarized most at the edges of intersections and least at the segments of channels.
We have examined the adsorption and reaction of ethylamine, isopropylamine, 2-ethylhexylamine, cyclooctylamine, and diphenylethylamine on H-ZSM-5, H-Y, and silica-alumina samples using temperature-programmed desorption (TPD) and thermogravimetric analysis (TGA). Each of the amines decomposes at Bum&
Incorporation of N,NЈ-diphenylhydrazine into HZSM-5 led to the formation of azobenzene and aniline (70Ϫ80 mol-% mass balance). The formation of azobenzene can be followed by the appearance in diffuse reflectance UV/Vis spectroscopy of a characteristic band (λmax = 420 nm). IR spectra of the extracte
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