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Interaction of ethylene and hydrogen with a commercial Pd black: carbon accumulation and possible adsorbate-induced rearrangement

MPS-Authors

Paál,  Zoltan
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Institute of Isotope and Surface Chemistry, CRC, Hungarian Academy of Sciences;

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Wild,  Ute
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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

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Citation

Paál, Z., Wild, U., & Schlögl, R. (2001). Interaction of ethylene and hydrogen with a commercial Pd black: carbon accumulation and possible adsorbate-induced rearrangement. Physical Chemistry Chemical Physics, 3(21), 4644-4649. doi:10.1039/B102561A.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-19B1-C
Abstract
The interaction of hydrogen, ethylene and their mixtures with a commercial Pd black was studied. Hydrogen treatment at 300 K created a rather clean Pd surface with some residual carbon. Ethylene introduced in high hydrogen excess exerted hardly any influence on the metallic properties of Pd, as shown by X-ray and ultraviolet photoelectron spectroscopy (XPS and UPS). The carbon content did not change. Contacting Pd with ethylene in low excess of H-2 or without any hydrogen changed the Pd 3d line, indicating its chemical interaction with C. Simultaneously, a new component appeared in the C 1s region at BE similar to 283.5 eV. It indicated the formation of Pd-C bonds, responsible for changes in the Pd valence state. Intensity drop at the near-Fermi edge region in UPS corroborated this interaction. Pd also underwent considerable structural rearrangement, as shown by the appearance of a large peak in the UP spectra at similar to8 eV, corresponding to the enrichment of the sodium carbonate impurity on the surface. This component proved to be a good indicator of surface flexibility