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

Paper ID Volume ID Publish Year Pages File Format Full-Text
43276 45961 2008 8 PDF Available
Title
Reaction kinetics of liquid phase air oxidation of p-cresol to p-hydroxybenzaldehyde
Abstract

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.

Graphical abstractKinetics 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 full-size imageDownload as PowerPoint slide

Keywords
p-Cresol oxidation; Kinetics; XRD; XPS; Co3O4
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Reaction kinetics of liquid phase air oxidation of p-cresol to p-hydroxybenzaldehyde
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 339, Issue 1, 15 April 2008, Pages 28–35
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us