Abstract
Abstract Carbon monoxide methariation on a commercial Ni/SiO 2 catalyst has been investigated by transient kinetic methods. It was found that carbon monoxide blocks the adsorption of hydrogen and replaces it on the catalyst surface. Oxygenated and non-oxygenated reaction intermediates were found on the catalyst surface between 458 and 538 K. in amounts exceeding severalfold the monolayer coverage. This extensive deposition was due to the presence of hydrogen in the gaseous phase. The volume deposits was unreactive under steady-state reaction conditions but reactive under dynamic conditions. Therefore, the reaction scheme proposed to describe the observed system behavior includes steady-state and unsteady-state reaction steps. Two types of activity sites, a substitution mechanism of CO adsorption, the storage of intermediates on sites other than reaction ones, and their variable concentration depending on the reaction conditions are considered.
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