Kinetic analysis of a generalized catalytic selective oxidation reaction

Research output: Contribution to journalArticle

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Abstract

A kinetic model is presented for a generalized catalytic selective oxidation reaction in which lattice oxygen is the proximate source of oxygen. The model takes into account the effects on the overall kinetics due to finite residence time of intermediates on the surface, diffusional rate of lattice oxygen, and overall stoichiometry of the reaction. It is shown that except under the condition when adsorption of the hydrocarbon reactant is the slow step, the rate expression derived from this model differs from that obtained with a model in which these effects are neglected. One important consequence of the model is that the rate of consumption of hydrocarbon can be changed if the selectivity of the reaction is changed, even when reoxidation of the catalyst is the rate-limiting step. In such a circumstance, the rate might show an order dependence in oxygen partial pressure, the apparent activation energy reflects that of reoxidation and the temperature dependence of the selectivity, and the apparent preexponential factor is also influenced by the stoichiometry of the reaction. The implications of these to the interpretation of substituent effects and deuterium kinetic isotope effects are discussed.

Original languageEnglish
Pages (from-to)691-701
Number of pages11
JournalJournal of Catalysis
Volume134
Issue number2
DOIs
Publication statusPublished - 1992

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Oxidation
oxidation
Kinetics
Oxygen
kinetics
oxygen
Hydrocarbons
Stoichiometry
stoichiometry
hydrocarbons
selectivity
Deuterium
Isotopes
Partial pressure
isotope effect
partial pressure
deuterium
Activation energy
activation energy
Adsorption

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Kinetic analysis of a generalized catalytic selective oxidation reaction. / Kung, Harold H.

In: Journal of Catalysis, Vol. 134, No. 2, 1992, p. 691-701.

Research output: Contribution to journalArticle

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