An experimental investigation of CO oxidation over well-characterized Pt/Al203 catalysts in an integral reactor under the conditions of forced feed composition cycling is presented, and various ways for possible improvements in the cyclic performance of automotive catalysts are considered. The effects of time-average feed composition, as well as of catalyst impregnation depth, on the cyclic performance are also examined. The results indicate that the most effective operating strategy for CO oxidation over Pt/Al203 catalysts is a hybrid scheme: cyclic operation during the warm-up period up to 300 °C and steady operation for temperatures above 300 °C. In the hightemperature range above 350 °C, the reaction yield for the stoichiometric cyclic operation may be improved by increasing the partial pressure of reactants. The chromatographic and antlchromatographic effects on the catalyst activity during cyclic operation are discussed.

No abstract