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Title
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Reaction of with trichlorosilylated silica gel : a study of the reaction mechanism as a function of temperature
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Author
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Abstract
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| Activation of the silica substrate with chlorosilanes increases the ammonia uptake by a factor of 5-10, compared with untreated silica. The reaction mechanism of ammonia with trichlorosilylated silica gel is examined in detail. Physisorbed NH4Cl causes a shift in the Si-NH2 stretching vibrations. Several side reactions occur during the chlorosilylation step, the ammoniation step and the thermal treatment of the reacted sample. Amine functions subsequently convert to silazanes and eventually nitrides. A novel mechanism for silazane formation is proposed. The different species on the silica surface are quantified as a function of the reaction temperature. |
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Language
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English
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Source (journal)
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Journal of the Chemical Society : Faraday transactions: physical chemistry and chemical physics / Bunsengesellschaft für Physikalische Chemie. - London, 1990 - 1998
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Journal of the Chemical Society: Faraday transactions
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Publication
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London
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Royal Society of Chemistry
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1993
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ISSN
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0956-5000
[print]
1364-5455
[online]
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DOI
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10.1039/FT9938902509
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Volume/pages
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89
:14
(1993)
, p. 2509-2513
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ISI
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A1993LN92600030
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Full text (Publisher's DOI)
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