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- W2000167211 abstract "The effects of the carrier and pretreatment temperature on the oxidation state of Ce and Pt were evaluated in Pt/Al2O3, Pt/CeO2, and Pt/CeO2−Al2O3 catalyst samples with various CeO2 loadings by applying the following spectroscopic techniques to the samples: X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR) spectroscopy of CO adsorption. XRD showed that ceria agglomerates at high CeO2 loadings (>3 wt %) and at a high temperature of calcination. XPS spectra showed that Ce(III) is formed more easily in the presence of Pt caused by the electron transfer between Pt and CeO2. A variation in the intensity and a shift in the IR bands from CO adsorbed on reduced Pt were observed, as a function of the temperature of reduction and type of the support. A heterogeneous distribution of linearly adsorbed CO on Pt at terraces and defect sites was proposed for Pt/Al2O3 reduced at the lower temperature (623 K), while at the higher temperature of reduction (773 K) a complete reduction of the Pt was observed. The higher reduction temperature and increasing the CeO2 loading led to a more uniform distribution of Pt on Pt/CeO2−Al2O3, related to the presence of highly unsaturated Pt caused by the strong interaction between Pt and Ce-modified alumina. The electronic effect dominates in Pt/CeO2 samples reduced at very high temperature (973 K)." @default.
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- W2000167211 date "2004-04-01" @default.
- W2000167211 modified "2023-10-14" @default.
- W2000167211 title "Surface Behavior of Alumina-Supported Pt Catalysts Modified with Cerium as Revealed by X-ray Diffraction, X-ray Photoelectron Spectroscopy, and Fourier Transform Infrared Spectroscopy of CO Adsorption" @default.
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- W2000167211 doi "https://doi.org/10.1021/jp031167s" @default.
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