Abstract
Carbon deposition of benzene on iron was studied at 550–700°C with 0–1 atm hydrogen in the carrier gas. At least three types of carbon are formed: amorphous, graphitic and carbidic (Fe 3C). The surface of Fe 3C is essentially inactive for benzene decomposition. In the presence of H 2, a metallic surface is maintained resulting in a high activity and hence an accelerating effect by H 2. In the reaction system five competing reactions are involved and the net rate of carbon deposition is the sum of the individual rates. Based on the results in this study, the retarding effects of H 2 on carbon deposition reported in the literature can also be explained. The methanation reaction of surface carbon by H 2 becomes important under conditions when the surface is relatively inactive for hydrocarbon decomposition, and under such conditions, H 2 has a retarding effect on carbon deposition.
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