Abstract
In this chapter, we compare the reactivity and stability of Pt–Fe and Pt–Ni bicomponent catalysts. The interfacial confinement effect results in the formation of monolayer-thick FeO1−X and NiO1−X nanoislands on Pt(111). The edge structures of the FeO1−X and NiO1−X nanoislands provide the active sites for O2 dissociative adsorption, and thus promote CO oxidation reaction. But the stabilities of FeO1−X/Pt(111) and NiO1−X/Pt(111) systems are different after the oxidation at 473 K with a O2 partial pressure of 1.3 × 10−6mbar. FeO1−X nanoisland is oxidized to O–Fe–O trilayer structure after oxidation, while the chemical state of NiO1−X is unchanged after same oxidative treatment. The result of model catalytic systems is well consistent with the observation of supported Pt–Fe/CB and Pt–Ni/CB catalysts. In situ XANES investigations show the chemical state of Fe is 2+ under CO oxidation with excess H2, whereas the Fe is further oxidized in O2-rich atmosphere. In contrast, the chemical state of Ni is constant under H2-rich and O2-rich CO oxidation conditions. Therefore, the CO conversion over Pt–Ni/CB catalyst increases when the concentration of O2 is increasing.
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Mu, R. (2017). Comparison of Pt–Fe and Pt–Ni Catalysts. In: Construction and Reactivity of Pt-Based Bi-component Catalytic Systems. Springer Theses. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-55244-5_5
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DOI: https://doi.org/10.1007/978-3-662-55244-5_5
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