Rate multiplicity and oscillations in single species surface reactions

摘要: Abstract The steady states for surface reaction of a single species in an isothermal stirred reactor are examined various functional forms adsorption, desorption, and rates. Adsorbate-adsorbate interactions, vacant site requirements, precursor intermediates, other deviations from Langmuir kinetics shown to introduce factors rates which can be approximated as e−αθ or (1−θ)m. It is that these the term lead multiple states, although with three at least one stable, producing hysteresis but no oscillatory states. A factor desorption rate produce oscillations. However, this occurs only when adsorption-desorption equilibrium isotherm predicts phases. number stability then depends on whether load line intersects metastable, unstable branches adsorption isotherm. Introduction several simultaneous anomalies relaxation assumptions oscillations obtained phases predicted. Oscillations will observed metastable sufficiently stable uniform phase exists because coexistence tends eliminate both hysteresis.