Various features of NO+CO reaction kinetics on Pt(100) surfaces, including temporal oscillations, are well described by a three‐variable model incorporating only the CO, NO, and O coverages. Here we analyze the corresponding reaction–diffusion equations demonstrating the existence of chemical waves where an ‘‘oscillating phase’’ displaces an unreactive NO/CO phase leaving a spatially periodic structure in its wake; pulses excited via inhomogeneities from an unreactive NO/CO background; and Turing structures for sufficiently unequal NO and CO diffusion rates.
REFERENCES
1.
S. P. Singh-Boparai and D. A. King, 3rd European Conference on Surface Science (ECOSS-3), Cannes, 1980;
2.
M. W.
Lesley
and L. D.
Schmidt
, Surf. Sci.
155
, 215
(1985
)., Surf. Sci.
3.
R. L.
Klein
, S.
Schwartz
, and L. D.
Schmidt
, J. Phys. Chem.
89
, 4908
(1985
);4.
Th.
Fink
, J.-P.
Dath
, M. R.
Bassett
, R.
Imbihl
, and G.
Ertl
, Surf. Sci.
245
, 96
(1991
).5.
Th.
Fink
, J.-P.
Dath
, R.
Imbihl
, and G.
Ertl
, J. Chem. Phys.
95
, 2109
(1991
).6.
R. Imbihl, Th. Fink, and K. Krischer, J. Chem. Phys. (in press).
7.
R. J.
Behm
, P. A.
Thiel
, P. R.
Norton
, and G.
Ertl
, J. Chem. Phys.
78
, 7437
(1983
).8.
A. S. Mikhailov, Foundations of Synergetics I, Springer Series in Synergetics, Vol. 52 (Springer, Berlin, 1990).
9.
G. Veser and R. Imbihl, J. Chem. Phys. (submitted).
10.
11.
L. D. Schmidt (private communication, unpublished results).
12.
The choice of coverages and for the initial O-rich (-poor) regions is guided by the characteristics of the self-generated structures described above.
13.
J. W. Evans, Kinetic Phase Diagrams for Monomer-Dimer Surface Reactions (submitted to J. Chem. Phys.).
This content is only available via PDF.
© 1992 American Institute of Physics.
1992
American Institute of Physics
You do not currently have access to this content.
