Abstract
X-ray diffraction and Mössbauer spectroscopy have been used to investigate the chemical state of a supported iron–cobalt catalyst during the disproportionation of carbon monoxide at 800 K. The results of this study have demonstrated a strong implication of cementite Fe 3C (may be in association with a cobalt carbide) in the alloy deactivation process. The deactivation due to the carburization is apparently reversible. The catalyst was, indeed, shown to partially recover its activity when submitted to conditions under which the carbide formation was not thermodynamically possible. The results of this study seem to indicate, however, that the alloy deactivation is not the consequence of a single phenomenon but results from the conjunction of two distinct processes. Additional deactivation due to the formation of a carbon layer at the particles surface appears as the most plausible hypothesis to explain this result.
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