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- W2005044566 abstract "Commercial silica-aluminas contain aluminium atoms tetra- and hexacoordinated to oxygen. After dehydration at 1 Pa at temperatures above 370 K, their1H MAS NMR spectra show silanol groups and OH groups bonded to aluminium atoms but no acidic bridging OH groups. Spectra of samples dehydrated at lower temperature give clear evidence for such acidic OH groups.29Si MAS and CP-MAS NMR spectra of silica-aluminas with low silica concentration show mainly SiO4 tetrahedra bonded to four others and silicon atoms, bonded to OH groups, whose29Si chemical shift is upfield of that generally attributed to terminal SiOH or geminal Si(OH)2. The environment of SiO4 tetrahedra in the sample with SiO2:Al2O3 = 75:25, prepared by coprecipitation, is random." @default.
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- W2005044566 date "1991-10-01" @default.
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- W2005044566 title "Multinuclear high-resolution solid-state nuclear magnetic resonance studies of amorphous silica-aluminas" @default.
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- W2005044566 doi "https://doi.org/10.1016/0166-9834(91)80032-r" @default.
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