A reactive phase diagram of CO oxidation on Pd(110) : steady and oscillatory states

The steady and oscillatory regions of the CO oxidation reaction on the Pd(110) surface have been determined as a function of externally controlled parameters (flow rate, CO and oxygen partial pressures, temperature) over a wide range. At constant sample temperature and flow rate, the experiments yie...

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Bibliographic Details
Published in:The Journal of chemical physics 1993-06, Vol.98 (11), p.9177-9184
Main Authors: EHSASI, M, BERDAU, M, REBITZKI, T, CHARLE, K.-P, CHRISTMANN, K, BLOCK, J. H
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Solid-gas interface
Surface physical chemistry
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Summary:The steady and oscillatory regions of the CO oxidation reaction on the Pd(110) surface have been determined as a function of externally controlled parameters (flow rate, CO and oxygen partial pressures, temperature) over a wide range. At constant sample temperature and flow rate, the experiments yield a characteristic cross-shaped phase diagram separating regions of monostability, bistability, and oscillatory behavior. The existence of a cross-shaped phase diagram indicates the operation of a slow feedback process, which could be traced back to the (experimentally verified) formation and retarded removal of subsurface oxygen during the reaction. The diagram reflects one of the first well-defined oscillatory systems in heterogeneous catalysis and may provide a general basis for mechanistic studies and models of oscillatory surface reactions.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.464425