Abstract
Temperature-programmed gasification with O 2, CO 2 and H 2 is used for the characterization of carbon deposits on Ni/Al 2O 3 and Co/Al 2O 3, based on the difference in reactivity of the several types of deposits. These deposits were formed by CO disproportionation at 675 K, 725 K and 775 K. The gasification patterns show the existence of mainly two types of carbon deposits. One form is attributed to filamentous carbon, the second form is believed to have a more graphitic structure. The TPG patterns are strongly influenced by the oxidation state and the catalytic activity of the metal(oxide) on the gasification of carbon.
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