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• W2137392330 abstract "Es wurden röntgenamorphe SiO2Al2O3-Festkörper unterschiedlicher Si/Al-Verhältnisse mit der 27Al-NMR-Spektroskopie unter Verwendung der schnellen Probenrotation um den Magischen Winkel (MAS) untersucht und IR-spektroskopisch charakterisiert. Die Na- und NH4-Formen dieser Substanzen besitzen Alumosilicatstruktur. Die zu den H-Formen führende thermische Deammonisierung der NH4-Formen bewirkt eine irreversible strukturelle Schädigung des Alumosilicatgerüsts. Dabei wird ein Teil der AlO4-Einheiten unter Koordinationszahlwechsel in AlO6-Einheiten umgewandelt. Das Fortschreiten der Festkörperreaktion mit weiterer thermischer Behandlung der H-Formen zeigt sich in einer starken Verbreiterung der NMR-Signale und in einer Verringerung der Nachweisintensität. Die Übertragbarkeit entsprechender Beobachtungen an vergleichbaren Zeolithen einschließlich des Auftretens von „Extragitter”︁-Aluminium auf amorphe Analoga wird diskutiert. 27Al MAS N.M.R. and I.R. Investigations on the Aluminium Coordination in Amorphous Silica-Alumina Gels Amorphous silica-alumina of different Si/Al ratios have been investigated by 27Al magic-angle spinning n.m.r. (MAS n.m.r.) and i.r. spectroscopy. Aluminosilicate framework structures were found for the Na+- and NH4+-exchanged forms of the investigated gels. The thermal deammoniation of the NH4+-exchanged gels, producing the H+ forms, causes an irreversible damage of the aluminosilicate framework. This process is accompanied by a change of the coordination state of a part of the aluminium, converting AlO4 into AlO6 units. The progress of the solid-state reaction upon further thermal treatment of the H+ forms is reflected by a considerable broadening of the n.m.r. spectra and a decrease of the intensity. The possibility that well-known results, including those of nonframework aluminium, obtained for comparable zeolitic systems may also be valid for amorphous solids, is discussed." @default.
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• W2137392330 title "27Al-MAS-NMR- und IR-spektroskopische Untersuchungen zur Aluminium-Koordination in r�ntgenamorphen SiO2 ?Al2O3-Festk�rpern" @default.
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• W2137392330 doi "https://doi.org/10.1002/zaac.19845171016" @default.
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