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The deposition of pyrolytic carbon in silica reactors

✍ Scribed by C.F. Cullis; A.C. Norris

Publisher: Elsevier Science
Year: 1971
Tongue: English
Weight: 310 KB
Volume: 9
Category: Article
ISSN: 0008-6223
DOI: 10.1016/0008-6223(71)90032-7

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✦ Synopsis

When

surface carbons are produced by the pyrolysis of gaseous hydrocarbons in a silica tube heated to about lOOO"C, spectrographic analysis shows the presence of up to 1% silicon even when the carbon is deposited on a metal substrate. It seems likely that hydrocarbon radicals react with silica to produce volatile organo-silicon species. As a result, silicon eventually becomes incorporated in the solid carbon, although neither the free element nor silicon carbide appear to be formed. Consideration of the present and previous results indicates that the chemical reactivity of silica surfaces needs to be taken into account in studies of pyrolytic deposition and of catalysis at high temperatures.

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