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Stability and excitation of potassium promoter in iron catalysts – the role of KFeO2 and KAlO2 phases

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Abstract

Well‐characterized catalyst model compounds of KAlO2 and KFeO2 are investigated by thermal desorption of potassium from the material. The desorbing fluxes of ions, atoms and highly excited states (field ionizable Rydberg states) were studied with surface and field ionization detectors in a vacuum apparatus. From the Arrhenius plots the activation energies for desorption of K and K+ were determined. The chemical state of potassium at the surfaces is concluded to be: ionic on KAlO2 (with the K desorption barrier of 1.76 eV) and covalent on KFeO2 (barrier of 2.73 eV). These results agree with the data obtained earlier for industrial catalysts for ammonia and styrene production. They are interpreted in terms of the Schottky cycle, which is completed for KAlO2 and fails for KFeO2. This failure indicates a non‐equilibrium desorption process. K Rydberg states are only found to desorb from KFeO2, in agreement with the suggestion that such states in some way are responsible for the catalytic activity.

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Authors and Affiliations

  1. Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30‐060, Krakow, Poland

    Andrzej Kotarba, Stanisław Hodorowicz & Jerzy Sokołowski

  2. Regional Laboratory of Physicochemical Analyses and Structural Research, Jagiellonian University, Ingardena 3, 30‐060, Krakow, Poland

    Andrzej Barański

  3. Institute of Physics, Jagiellonian University, Reymonta 4, 30‐059, Krakow, Poland

    Andrzej Szytuła

  4. Department of Chemistry, Reaction Dynamics Group, Göteborg University, SE‐412 96, Göteborg, Sweden

    Leif Holmlid

Authors
  1. Andrzej Kotarba
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  2. Andrzej Barański
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  3. Stanisław Hodorowicz
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  4. Jerzy Sokołowski
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  5. Andrzej Szytuła
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Kotarba, A., Barański, A., Hodorowicz, S. et al. Stability and excitation of potassium promoter in iron catalysts – the role of KFeO2 and KAlO2 phases. Catalysis Letters 67, 129–134 (2000). https://doi.org/10.1023/A:1019013504729

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