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The oxidation state of cobalt in various forms (single crystal, nanopowder, deposited on CeO2 and ZnO supports) was investigated in situ under O2, H2 and ethanol steam reforming (ESR) conditions (C2H6O:H2O = 1:3) by using ambient pressure X-ray photoelectron and absorption spectroscopies. In O2 atmosphere single crystalline, nanopowder and CeO2-supported cobalt is readily oxidized into a spinel Co...
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