Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5419408 | Journal of Molecular Structure: THEOCHEM | 2006 | 4 Pages |
Abstract
We present a study of the dynamical behavior of a Ziff-Gulari-Barshad model with CO desorption and lateral diffusion. Depending on the values of the desorption and diffusion parameters, the system presents a discontinuous phase transition between low and high CO coverage phases. We calculate several points on the coexistence curve between these phases. Inclusion of the diffusion term produces a significant increase in the CO2 production rate. We further applied a square-wave periodic pressure variation of the partial CO pressure with parameters that can be tuned to modify the catalytic activity. Contrary to the diffusion-free case, this driven system does not present a further enhancement of the catalytic activity, beyond the increase induced by the diffusion under constant CO pressure.
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Authors
G.M. BuendÃa, E. Machado, P.A. Rikvold,