Title
Reaction of <tex>$NH_{3}$</tex> with trichlorosilylated silica gel : a study of the reaction mechanism as a function of temperature Reaction of <tex>$NH_{3}$</tex> with trichlorosilylated silica gel : a study of the reaction mechanism as a function of temperature
Author
Faculty/Department
Faculty of Sciences. Chemistry
Faculty of Sciences. Bioscience Engineering
Publication type
article
Publication
London ,
Subject
Physics
Chemistry
Source (journal)
Journal of the Chemical Society: Faraday transactions
Journal of the Chemical Society: Faraday transactions: physical chemistry and chemical physics / Chemical Society [London] - London
Volume/pages
89(1993) :14 , p. 2509-2513
ISSN
0956-5000
ISI
A1993LN92600030
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
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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