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A dynamic study of CO oxidation on supported platinum
Author(s) -
Barshad Yoav,
Gulari Erdogan
Publication year - 1985
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690310415
Subject(s) - platinum , isothermal process , duty cycle , carbon dioxide , work (physics) , chemistry , catalysis , steady state (chemistry) , reaction mechanism , thermodynamics , materials science , analytical chemistry (journal) , chromatography , physics , organic chemistry , power (physics)
Catalytic oxidation of CO on alumina‐supported platinum was studied in a tubular isothermal reactor with applied concentration transients. A completely automated reactor system capable of switching frequencies as high as 0.2 Hz was constructed. Concentration cycling resulted in reaction rates that were much higher than the maximum rate achievable at steady‐state operation. Mapping of the time‐averaged carbon dioxide production rate in the time‐period duty‐fraction plane, resulted in a unique global maximum. We find that the maximum in rate occurs when the switching times are comparable to the characteristic time of the surface reaction. Results of our experiments also rule out significant contribution from the Eley‐Rideal mechanism at the temperature range of this work (below 120°C).