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  Identification of the state of palladium in various hydrogenation catalysts by XPS

Noack, K., Zbinden, H., & Schlögl, R. (1990). Identification of the state of palladium in various hydrogenation catalysts by XPS. Catalysis Letters, 4, 145-156. doi:/10.1007/BF00765697.

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 Creators:
Noack, Klaus1, Author
Zbinden, Heinz1, Author
Schlögl, Robert2, Author              
Affiliations:
1Central Research Units, F. Hoffrnann-La Roche & Co.A.G., CH-4002 Basel, Switzerland , ou_persistent22              
2Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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 Abstract: Various commercial supported palladium hydrogenation catalysts were studied by XPS and treated at ambient pressure with hydrogen and air. Unused catalysts exhibit a significant fraction of divalent Pd (oxide) which is reduced by hydrogen treatment at room temperature. Exposure to air in systems with carbonate, alumina, silica or active carbon as support causes the formation of a solid solution of oxygen in Pd characterized by a Pd 3d chemical shift of ca. + 0.4 eV. The absolute binding energy of Pd depends strongly on the matrix, indicating a significant contribution of extra-atomic screening, which prevents a direct comparison of reference samples and supported catalysts. Using the oxidation of CO to CO2 at 300 K as in situ chemical probe it was confirmed that Pd supported on carbonate, silica and alumina exists in the same metallic state which could be activated for the test reaction irrespective of the variation in XPS binding energies.

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Language(s): eng - English
 Dates: 1989-09-121989-12-081990-03
 Publication Status: Published in print
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: /10.1007/BF00765697
 Degree: -

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Title: Catalysis Letters
  Abbreviation : Catal. Letters
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: New York : Springer
Pages: 11 Volume / Issue: 4 Sequence Number: - Start / End Page: 145 - 156 Identifier: ISSN: 1011-372X
CoNE: https://pure.mpg.de/cone/journals/resource/954925586300