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  Preparation, characterization and catalytic testing of GePt catalysts

Győrffy, N., Bakos, I., Szabó, S., Tóth, L., Wild, U., Schlögl, R., et al. (2009). Preparation, characterization and catalytic testing of GePt catalysts. Journal of Catalysis, 263, 372-379. Retrieved from http://dx.doi.org/10.1016/j.jcat.2009.02.029.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-F970-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-F971-2
Genre: Journal Article

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429300JCatal.pdf (Preprint), 608KB
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 Creators:
Győrffy, Nóra, Author
Bakos, Istvan, Author
Szabó, Sandor, Author
Tóth, Lajos, Author
Wild, Ute1, Author              
Schlögl, Robert1, Author              
Paál, Zoltan, Author
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Free keywords: GePt; Bimetallic catalyst; Underpotential deposition; XPS; EFTEM; Hexane isomerization; Aromatization; Methylcyclopentane ring opening Platinum in Catalysis
 Abstract: Unsupported and SiO2 supported GePt bimetallic catalysts were prepared by depositing Ge on to Pt underpotentially. Surface-sensitive cyclic voltammetry of Pt black indicated that Ge covered ca. 40–45% of the Pt surface, whereas XPS showed just 96% Pt and 4% Ge (normalized to Pt+Ge=100%). High-resolution Ge map of GePt black obtained by Energy Filtered TEM (EFTEM) showed Ge scattered in the near-surface regions. Both catalysts were tested in hexane (nH) transformation reactions between 543 and 603 K and 60 to 480 Torr H2 pressure (with 10 Torr nH), and compared with the parent Pt catalysts. GePt/SiO2 catalyst was also tested with methylcyclopentane (MCP). Adding Ge to Pt/SiO2 lowered the activity; the opposite effect was observed with GePt black. The selectivities of saturated products on bimetallic catalysts decreased, while those of hydrogenolysis products, benzene and hexenes increased in nH transformations over supported catalyst. The reverse effects were observed over the black samples where addition of Ge prevented accumulation of adventitious carbon. Ring opening was the main reaction with MCP, together with some fragments, benzene and unsaturated hydrocarbons. Ring opening of MCP became more selective with decreasing temperature and increasing hydrogen pressure. Ge on GePt black blocked contiguous Pt sites favoring the formation of coke precursors. The different catalytic behavior of GePt/SiO2 indicated somewhat different Pt–Ge interaction(s).

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Language(s): eng - English
 Dates: 2009-04-25
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 429300
URI: http://dx.doi.org/10.1016/j.jcat.2009.02.029
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Title: Journal of Catalysis
  Alternative Title : J. Catal.
Source Genre: Journal
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Pages: - Volume / Issue: 263 Sequence Number: - Start / End Page: 372 - 379 Identifier: -