Publication
Title
Reaction of $NH_{3}$ with trichlorosilylated silica gel : a study of the reaction mechanism as a function of temperature
Author
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.
Language
English
Source (journal)
Journal of the Chemical Society: Faraday transactions: physical chemistry and chemical physics / Chemical Society [Londen] - London
Journal of the Chemical Society: Faraday transactions
Publication
London : 1993
ISSN
0956-5000
Volume/pages
89:14(1993), p. 2509-2513
ISI
A1993LN92600030
Full text (Publisher's DOI)
UAntwerpen
 Faculty/Department Research group Publication type Subject Affiliation Publications with a UAntwerp address