Abstract
The object of the presented work was to compare the catalytic influence of nickel and potassium in hydrogenative and steam gasification of a model system and to investigate the effect of preparation variations. It was found that nickel and potassium behave fundamentally different. Nickel shows two types of catalysis. The first one manifests itself at low burn off percentages even at temperatures below 1000 K and is mainly dependent on the dispersion and the carbon interaction. Deactivation is explained by carbon diffusion limitation caused by blocking of the metal surface. The second type of catalysis taking place at higher temperatures is governed by a redox mechanism in which gas phase interaction is predominant and sintering causes deactivation. In both cases CO is the primary reaction product. Water vapour strongly catalyses the hydrogenative gasification. In catalysis by potassium no deactivation is observed and primarily CO 2 is formed. For both nickel and potassium reaction mechanisms are elaborated.
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