The reaction of carbon monoxide and carbon monoxide/hydrogen mixtures with two catalysts, a pure cobalt catalyst and a cobalt on alumina catalyst has been studied, mainly in the thermobalance. It appears that the support prevents carbon diffusion into the cobalt crystallites, whereas on the pure cobalt catalysts the carbide Co3C is formed as the first product. Hydrogen efficiently prevents the formation of carbides in the pure cobalt catalysts; on the supported catalysts relatively large quantities of intermediates are deposited from carbon monoxide/hydrogen mixtures. The observed effects are explained by an interaction between alumina and cobalt that reduces the cobalt‐carbon bond strength and the hydrogen activity on the supported catalyst.
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