Abstract
This paper reports on a study using isotopic transient kinetics analysis (ITKA) to understand the initial rapid deactivation behavior of a 5 wt% Pt/ γ-Al 2O 3 catalyst during selective CO oxidation in hydrogen. The Pt catalyst exhibited the rapid deactivation typically seen for such catalysts during the initial reaction period. Based on ITKA results, the pseudo-first-order intrinsic rate constant was found to be relatively constant with time on stream while the concentration of surface intermediates leading to CO 2 decreased significantly. It can be concluded that the deactivation of this Pt catalyst is mainly the result of a decrease in the concentration of surface intermediates as a result of carbon deposition, not a change in the intrinsic site activity.
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