Abstract
Chemical vapor deposition (CVD) of carbon from hydrocarbons is used for fabrication of advanced carbon materials as well as involved in some hydrocarbon processing for synthesis of chemical products. Hydrocarbon pyrolysis is so rapid that a variety of hydrocarbons in besides feed reactant contribute to the carbon deposition in these reactors. However, carbon deposition from only some of hydrocarbons has been intensively studied. In this study, the surface reaction rate of allene and allylene was investigated at a total pressure of 6.7 kPa and temperature of 960-1050{degree sign}C using a thin tubular CVD reactor. The pyrocarbon growth rates from allene and allylene were found approximately equal and as high as that from propylene. Effects of temperature, partial pressure, and reactor tube diameter on the CVD rate were examined. The surface reaction rate was formulated by a Langmuir-type equation.
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