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Deposition of carbon and its hydrogenation catalyzed by nickel

✍ Scribed by Y. Nishiyama; Y. Tamai

Publisher: Elsevier Science
Year: 1976
Tongue: English
Weight: 528 KB
Volume: 14
Category: Article
ISSN: 0008-6223
DOI: 10.1016/0008-6223(76)90075-0

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✦ Synopsis

Formation of carbon on nickel sheet from benzene vapor carried by hydrogen was studied at a temperature range from 520 to 730°C. A maximum rate was observed at about 63o"C, above which the deposition rate decreased rapidly. The carbon formed was hydrogenated in situ. Methane was the main gaseous product and a m~imum rate was observed at about 67OY. Very high reactivity of deposited carbon toward hydrog~~tion was ascribed to the catalytic action of nickel particles dispersed in the carbon. The hydrogenation rates were divided into three zones and possible interpretations are discussed. A mechanism which is a reverse process to deposition was suggesled. The decrease of the hydrogenation rate at higher temperatures was due to the equilibrium among carbon, hydrogen and methane, where carbon was more reactive than graphite.

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