High-resolution proton magnetic resonance and catalytic studies concerning brønsted centers of amorphous Al2O3-SiO2 solids
✍ Scribed by M. Hunger; D. Freude; H. Pfeifer; H. Bremer; M. Jank; K.P. Wendlandt
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 384 KB
- Volume
- 100
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
By application of the magic angle spinning (BIAS) technique it was possible to observe highly resolved proton NMR spectra of the OH groups of amorphous silica-alumina. The spectra exhibit two lines at 2 and 7 ppm. The former line must be ascribed to non-acidic OH groups since it also occurs for silica and dumina. The latter line shows a maximum oiintensity in the range of 20-30 wt% A1203_ It must be due to acidic hydroxy! groups since the catalytic activity of the silica-aluminas measured by the cracking rate of cumene shows quantitatively the same behaviour with respect to the number of OH groups at 7 ppm.