Abstract
The selective oxidation of aqueous ethanol solution with air over a powdered commercial 1wt% Au/TiO2 catalyst was investigated in stirred mini-autoclaves. The catalyst was characterized by various techniques including N2 physisorption, XRD, ICP-OES, and TEM. Temperature, pressure, initial ethanol concentration, catalyst concentration, and reaction time were varied in order to successfully determine the parameters of a Langmuir–Hinshelwood–Hougen–Watson type reaction kinetics model, which was derived from the surface reactions. It is assumed that hydrogen abstraction by surface hydroxyl species is the rate-determining step. The model adequately describes the decreasing conversion at higher ethanol concentration and also the selectivities towards the products acetaldehyde, acetic acid, ethyl acetate, and CO2. The moderate description of the conversion at 180–200°C can be improved by expanding the model with a second reaction route.
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