Abstract
AbstractKinetics of CO oxidation over chromium sesquioxide with two reaction paths I and II was studied in detail in the temperature range of 378–445 K (105–172°C). The rate constants in each elementary step were estimated as a function of temperature by using transient response and steady‐state data without the help of a parameter optimisation technique. A comparison of their values showed that the rate of path I is limited by surface reaction, and the rate of path II is controlled by three steps: surface reaction; desorption of CO2; and adsorption of O2, which is the slowest step over the entire temperature range studied. Good agreement of the simulated response with the experimental response due to the linear temperature rise proved the validity of the mechanism and the kinetic analysis. The selectivity of reaction path I was also discussed.
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