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Journal Article

Photoelectron spectroscopy of polycrystalline platinum catalysts

MPS-Authors
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Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Ertl,  Gerhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Paál, Z., Schlögl, R., & Ertl, G. (1992). Photoelectron spectroscopy of polycrystalline platinum catalysts. Journal of the Chemical Society, Faraday Transactions, 88(8), 1179-1189. doi:10.1039/FT9928801179.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-2255-8
Abstract
Pt black catalysts have been characterized by X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). The spectra measured after standard purification (O2 and H2 at 600 K) compared well with those of a purified reference Pt foil. All samples exhibited pronounced Fermi-edge intensities in UPS although only 60–70% Pt was detected on their surfaces by XPS, the remainder being C and O. Line analysis of the C 1s XPS, region showed the presence of partly oxidized graphite and hydrocarbon polymer, likely in three-dimensional islands. OH/H2O species attached to the metallic Pt sites were detected by UPS bands, in agreement with O 1s XPS line analysis. Similar spectral features are recorded at 600 K. Carbon could not be removed entirely by O2 up to 850 K; hydrogen did not remove surface oxygen even up to 750 K. UPS features of C on Pt used in hydrocarbon reactions were similar to those reported for amorphous hydrogenated carbon overlayers. Consequences of the present findings for the catalytic properties of Pt in n-hexane reactions and the quantification of H2–O2 titration are discussed briefly.