✍ Scribed by A. Becker; Z. Hu; K.J. Hüttinger
No coin nor oath required. For personal study only.
Carbon depositions from ethene, ethine, propene, butadiene and benzene were studied in a ¯ow reactor at a temperature of 10008C, constant hydrocarbon partial pressures and increasing hydrogen partial pressures. Analogous studies with methane were performed at 11008C. Carbon deposition rates and corresponding compositions of the gas phase were determined. In the case of the C 2 -to C 6 -hydrocarbons the deposition rates are decreased by hydrogen addition, but the in¯uence on the gas phase compositions is less signi®cant. Hydrogen inhibition of carbon deposition is very sensitive as to the carbon/hydrogen ratio in the case of light, linear hydrocarbons, and the molecular structure if light, linear hydrocarbons are compared with aromatic hydrocarbons. It can be described by a strongly simpli®ed heterogeneous inhibition model. The model exhibits a physico-chemical meaning in the case of ethene, propene and butadiene. In the case of methane the gas phase composition changes by hydrogen addition; nevertheless, hydrogen inhibition of carbon deposition from this hydrocarbon as well as that from ethine and benzene is perfectly described by the model in a formal manner.
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Carbon deposition from ethene, ethine and propene as a function of pressure was studied at various temperatures and two different surface area / volume ratios. Deposition rates as a function of pressure of all hydrocarbons indicate Langmuir-Hinshelwood kinetics which suggests that the deposition pro
new method for forming isotropic, laminar, and columnar pyrolytic carbons is proposed. For this, a low RPM (below 2.4rpm) tumbling bed has been used to deposit pyrolytic carbons from hydrocarbon gases. All deposits were made on graphite substrates from propane and methane at a constant temperature o
OBSERVATIONS were made on the diffusion flames using a variety of fuels. iln outline of apparatus used is shown in Fig. 1.