Reaction kinetics of liquid phase air oxidation of p-cresol to p-hydroxybenzaldehyde

The kinetics of liquid phase oxidation of p-cresol to p-hydroxybenzaldehyde has been investigated using insoluble cobalt oxide (Co3O4) catalyst at oxygen partial pressures in the range 0.1–1.5 MPa, reaction temperatures 333–393 K, p-cresol concentrations 0.49–1.53 kmol/m3 and catalyst loadings 0.38–3.03 kg/m3. The effects of oxygen partial pressure, reaction temperature, p-cresol concentration and catalyst loading on the initial rate of reaction have been studied. The initial rate varied linearly with catalyst loading up to 1.5 kg/m3 beyond which it was independent of the catalyst loading while first-order dependence was observed with variation in oxygen partial pressure. A rate expression has been proposed considering Langmuir–Hinshelwood (LH) type mechanism, based on the initial rate data. A batch reactor model was also developed based on the kinetics studied and the concentration time profile predicted by the model was in good agreement with the experimental data. The activation energy for the liquid phase oxidation of p-cresol was found to be 39.6 kJ/mol.

Kinetics of liquid phase oxidation of p-cresol to p-hydroxybenzaldehyde was studied using insoluble cobalt oxide (Co3O4) catalyst. XRD and XPS characterizations were done to confirm the phases and the chemical composition of the catalyst. On the basis of initial rate data, a rate expression was proposed considering a Langmuir–Hinshelwood (LH) type mechanism. The concentration time profile predicted by the reactor model was in good agreement with the experimental data. Figure optionsDownload as PowerPoint slide