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Toward a general theory of heterogeneous reactions

Thermochemical approach

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Abstract

The thermochemical approach, using the quasi-equilibrium methodology of kinetic analysis and the concepts of equimolar and isobaric reaction modes (regimes), has been used to prove the common mechanism of the representative heterogeneous reactions: decompositions of CaCO3 and of Ag2O, reduction of NiO by H2, and the catalytic oxidation of CO and H2 on PtO2. All these rate processes have been analyzed using the congruent dissociative vaporization of the participating solid reactants or catalysts and are described by similar mechanistic schemes. The possible role of atomic oxygen evolution in oxidation catalysis is discussed. Quantitative proofs of the common mechanism of these reactions were provided by agreement between calculated reaction enthalpies and the Arrhenius E parameters, the retardation effect of gaseous products on the reaction rates, and the accordance between experimental and theoretical ratios of isobaric to equimolar values of the E parameter. In conclusion, milestones in the history of the thermochemical approach during the last century are discussed.

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Authors and Affiliations

  1. Department of Physical Chemistry, St Petersburg State Polytechnic University, St Petersburg, 195251, Russia

    Boris V. L’vov

  2. Department of Chemistry, Rhodes University, Grahamstown, 6140, South Africa

    Andrew K. Galwey

Authors
  1. Boris V. L’vov
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  2. Andrew K. Galwey
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Correspondence to Andrew K. Galwey.

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L’vov, B.V., Galwey, A.K. Toward a general theory of heterogeneous reactions. J Therm Anal Calorim 113, 561–568 (2013). https://doi.org/10.1007/s10973-012-2754-z

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