SCHEDULED MAINTENANCE
Cooperative effects in heterogeneous catalysis. Part 1.—Phenomenology of the dynamics of carbon monoxide oxidation on palladium embedded in a zeolite matrix
Abstract
Hysteresis behaviour, simple and complex oscillations showing a fractal pattern, long-term changes of the oscillations as well as periodic multistability have been uncovered during the oxidation of CO. Pd zeolites with different amounts of Pd particles per unit volume were used as a catalyst in order to study the synchronization process during the reaction. Zeolites with the highest Pd content showed the largest capability to oscillate, with amplitudes up to 95% of the conversion. Examination of the catalyst before and after the reaction leads to the assumption of a cyclic oxidation–reduction mechanism. Coupling of the individual particles is suggested by a concentration wave travelling across the surface.
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