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  Investigation of a traditional catalyst by contemporary methods: Parallel electron spectroscopic and catalytic studies on Pt black

Paál, Z., & Schlögl, R. (2009). Investigation of a traditional catalyst by contemporary methods: Parallel electron spectroscopic and catalytic studies on Pt black. Surface Science, 603(10-12), 1793-1801. doi:10.1016/j.susc.2008.08.044.

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 Creators:
Paál, Zoltán1, Author           
Schlögl, Robert1, Author           
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1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Free keywords: Electron spectroscopy; XPS; UPS; Pt catalyst; Hexane reactions; Catalyst carbonization Platinum in Catalysis
 Abstract: Results of electron spectroscopy (XPS and UPS) of platinum black catalyst measured in various states of the catalyst have been summarized. XPS showed up to almost 50% carbon and up to 20% oxygen on a sample stored in air. These, however, had almost no influence on the chemical state of Pt, except for the appearance of minor surface oxide. A Pt purity of 90% could be reached by regeneration with O2 and H2. The C 1s peak contained several components from individual C atoms to graphitic and polymeric hydrocarbon layers. Thus, the active catalyst was not clean Pt but metallic Pt; the impurities exerting little influence on catalytic activity. Regeneration and deactivation led also to slight structural rearrangement, as detected by XRD. Intentional deactivation with hydrocarbon–hydrogen mixtures was monitored by XPS, UPS and catalytic tests. Correlation was found between catalytic activity and selectivity in hexane reaction and the amount – and also the chemical state – of carbon accumulated during deactivating runs. A short summary of electron spectroscopy of supported Pt catalysts is also given. The main underlying idea regards solid catalyst and reactants as a dynamic system, including also solid-state changes of the former.

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Language(s): eng - English
 Dates: 2009
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 412507
DOI: 10.1016/j.susc.2008.08.044
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Title: Surface Science
  Alternative Title : Surf.Sci.
Source Genre: Journal
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Pages: - Volume / Issue: 603 (10-12) Sequence Number: - Start / End Page: 1793 - 1801 Identifier: -