VSE knjižnice (vzajemna bibliografsko-kataložna baza podatkov COBIB.SI)
  • Transient kinetic model of CO oxidation over a nanostructured ▫$Cu_{0.1}Ce_{0.9}O_{2-y}$▫ catalyst
    Sedmak, Gregor ; Hočevar, Stanko, 1947- ; Levec, Janez, 1943-2020
    The oxidation of carbon monoxide under dynamic conditions was studied over a novel nanostructured Cu0.1Ce0.9O2-y catalyst. CO temperature-programmed reduction provides a qualitative picture of the ... reducibility of that catalyst.Step-change experiments in CO concentration in the temperature range between 50 and 250 °C allowed us to estimate the oxygen storage capacity of the catalyst as a function of temperature. The measured CO and CO2 responses were used to construct a detailed transient kinetic model based on elementary reaction steps. In the modeling, elementary reaction steps such as the adsorption of CO on oxidized and reduced catalyst active sites, diffusion of subsurface lattice oxygen to the surface, reoxidation of reduced catalyst active sites by the subsurface lattice oxygen, and the surface reaction of CO to CO2 were considered. The calculated activation energies for various surface reaction steps were in the range from 9.7 to 39.6 kJ mol-1, for the catalyst reoxidation step 72.9 kJ mol-1, and for the lattice oxygen diffusion in the Cu0.1Ce0.9O2-y catalyst 40.0 kJ mol-1. These values are discussed in detail. The bulk oxygen diffusion coefficient is equal to 3.2*10-12 cm2 s-1 at 250 °C. This value is in the range of bulk diffusion coefficients measured over other oxide catalysts.
    Vir: Journal of catalysis. - ISSN 0021-9517 (Vol. 222, no. 1, 2004, str. 87-99)
    Vrsta gradiva - članek, sestavni del
    Leto - 2004
    Jezik - angleški
    COBISS.SI-ID - 2967322

vir: Journal of catalysis. - ISSN 0021-9517 (Vol. 222, no. 1, 2004, str. 87-99)
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