INIFTA   05425
INSTITUTO DE INVESTIGACIONES FISICO-QUIMICAS TEORICAS Y APLICADAS
Unidad Ejecutora - UE
artículos
Título:
The effect of NO/O2 ratio in NO-CO-O2 reaction on a catalytic surface: A computer simulation study.
Autor/es:
WAQAR AMHED,; EZEQUIEL V ALBANO
Revista:
APPLIED SURFACE SCIENCE
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2008 vol. 254 p. 2436 - 2440
ISSN:
0169-4332
Resumen:
The interaction among the reacting species in the NOCOO2
reaction on a metal catalytic surface that proceeds according to the
LangmuirHinshelwood mechanism is studied by means of Monte Carlo
simulation. The study of this three-component system is essential for
the understanding of the influence of NO/O2 ratio on the catalytic reduction of NO into N & O and oxidation of CO to CO2.
It is found that this complex system, which has not been studied on
these lines before, exhibits irreversible phase transitions between
active states with sustained reaction and poisoned states with the
catalytic surface fully covered by the reactants. The phase diagrams of
the surface coverage with CO, N or O and the steady state production of
CO2 are evaluated as a function of the partial pressure of
CO in the gas phase. From this study, it is observed that with the
addition of NO in the COO2 reaction, the critical points in
the phase diagram move towards lower values of CO partial pressure but
the width of reaction window remains almost the same. However, the
maximum production rate of CO2 decreases continuously. On the other hand, the addition of O2
in the NOCO reaction shifts the critical points towards higher values
of CO pressure. Moreover, the width of reaction window as well as the
production rate of CO2 increases with the increase in O2 concentration.