Catalytic oxidation of ethanol in the gas phase over Pt/Rh and Pd catalysts: kinetic study in a spinning-basket flow reactor

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Abstract

The catalytic oxidation of ethanol in the gas phase over Pt/Rh and Pd monolithic catalysts was performed in a spinning basket flow reactor with the aim of studying kinetics. The reactor was operated under atmospheric pressure and reaction temperature was varied between 50 and 300 °C. The inlet concentrations of ethanol and oxygen were in the range of 0.0060–0.0240 μmol/mL and 0.10–10.0 % v/v, respectively. Gas chromatography was used to follow the progress of the oxidation. Carbon dioxide and small amounts of methane and acetaldehyde were the only products detected in ethanol oxidation over the catalysts tested. Various kinetic models were tested in the analysis of the experimental data obtained. The Marquardt–Levenberg method was used for the minimization of the objective function for the residual sum of squares. The model that takes into account the surface reaction between adsorbed reactants was found to yield the most successful fit for both catalysts. According to this model, the activation energy of ethanol catalytic oxidation over Pt/Rh and Pd is 7903 and 6571 cal mol−1, respectively.

Original languageEnglish
Pages (from-to)487-501
Number of pages15
JournalReaction Kinetics, Mechanisms and Catalysis
Volume117
Issue number2
DOIs
Publication statusPublished - Apr 1 2016

Keywords

  • Carberry reactor
  • Langmuir–Hinshelwood
  • Monolithic catalysts

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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