ChemInform Abstract: Stationary Kinetics of Essential Reactions on Automobile Exhaust Pt-Rh/ Al2O3 Catalyst.
Abstract
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ChemInform Abstract
The kinetics of CO and propene oxidation and of NO reduction are studied over ceria-promoted Pt-Rh/Al2O3 catalysts under steady-state conditions at 10-400 °C and at atmospheric pressure under dry and wet gas conditions by measuring the CO, CO2, total hydrocarbons, NO/NOx, and O2 concentrations for different gas feeds at the three-way catalyst outlet. Water enhances the oxidation reactions at low temperatures while water-gas shift and steam reforming reactions proceed at high temperatures under wet conditions. From the proposed steady-state equations based on plausible surface reaction mechanisms for CO and propene oxidation, water-gas shift, and NO reduction, the steady-state kinetics on the commercial catalyst can be described as shown by the good agreement of experimental and predicted concentrations.
