Modeling of the Adsorption and Desorption of CO2 on Cu/ZrO2 and ZrO2 Catalysts

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Abstract
The interaction between carbon dioxide and two zirconia catalystsa Cu/ZrO2 catalyst containing 34% copper and a pure ZrO2 catalystwas studied by pulse adsorption and temperature-programmed desorption methods. Kinetic modeling by nonlinear regression was applied to acquire information on the adsorption and desorption of CO2 relevant in the synthesis of methanol from carbon dioxide. A model that included three types of adsorption sites described well the experimental data for both Cu/ZrO2 and ZrO2. The model assumed first-order kinetics and a Freundlich-type logarithmic dependence of adsorption enthalpy on surface coverage. The parameters of the model were well identified and were in the physically meaningful range. The results indicate that, at 30 °C, on both catalysts, carbon dioxide adsorbs reversibly on one type of site and irreversibly on two other types of sites.

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