The adsorption of nitric oxide on iron oxides
1970; Elsevier BV; Volume: 18; Issue: 2 Linguagem: Inglês
10.1016/0021-9517(70)90176-4
ISSN1090-2694
Autores Tópico(s)Minerals Flotation and Separation Techniques
ResumoAdsorption isotherms and rates were measured for NO chemisorption on supported and unsupported samples of Fe2O3 and Fe3O4 in the 26–150 °C temperature range. The adsorption behavior is well described by Freundlich isotherms in the pressure range from 1 to 200 Torr. Monolayer coverage is attained at 500 Torr for the reduced samples and at 25000 (by extrapolation) on the oxidized samples. Kinetic measurements were evaluated using the Elovich equation. These plots were monotonic in the case of supported Fe2O3 and showed a sharp discontinuity in the case of supported Fe3O4 at θ = 0.5. A close parallelism is noted with previously studied chemisorption behavior on reduced and oxidized supported chromium oxide.
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