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Kinetics of the water-gas shift reaction on an “FeO” surface

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Abstract

The rate of the water-gas shift reaction, CO2 + H2→ CO + H2O, has been determined on “FeO” as a catalyst between 700 and 1000°C by conversion and isotope-exchange measurements. Results of the two methods are in fair agreement and are consistent with the rate equation,

$$\dot n_{CO} /A = k'[a_O ](p_{CO_2 } - a_O p_{CO} ),$$

wherea O is the oxygen activity on the “FeO” surface. The rate limiting step is the adsorption-dissociation of CO2 on the surface. The dependence ofk’ on aO may be empirically expressed ask’[a O] =k o a O - m, wherem = 2/3 at 900°C. Possible causes for this behavior are discussed. Variation ofk o with T yieldsk o = 0.00717 exp(-124,700 ±6300 J/RT) mol/cm2 s atm. The activation energy agrees well with those determined from thermogravimetric studies of the linear oxidation of α-Fe (120.9 kJ/mol) and the oxidation-reduction of “FeO” within its range of nonstoichiometry (117.6 kJ/mol). It differs significantly, however, from the activation energy of 226.8 kJ/mol previously obtained for surface controlled oxidation of γ-Fe.

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Authors and Affiliations

  1. Dept. of Chemical, Metallurgical and Polymer Engineering, University of Tennessee, 37916, Knoxville, TN

    P. J. Meschter (Assistant Professor)

  2. Physical Chemistry Division, Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, West Germany

    H. J. Grabke (Professor)

Authors
  1. P. J. Meschter
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  2. H. J. Grabke
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Formerly Post-Doctoral Fellow, Max-Planck-Institut für Eisenforschung

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Meschter, P.J., Grabke, H.J. Kinetics of the water-gas shift reaction on an “FeO” surface. Metall Trans B 10, 323–329 (1979). https://doi.org/10.1007/BF02652502

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