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  Etching of the Intermetallic Compounds PdGa and Pd3Ga7: An Effective Way to Increase Catalytic Activity?

Kovnir, K., Osswald, J., Armbrüster, M., Teschner, D., Weinberg, G., Wild, U., et al. (2009). Etching of the Intermetallic Compounds PdGa and Pd3Ga7: An Effective Way to Increase Catalytic Activity? Journal of Catalysis, 264(2), 93-103. doi:10.1016/j.jcat.2009.03.007.

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 Creators:
Kovnir, Kirill1, Author              
Osswald, Jürgen1, Author              
Armbrüster, Marc, Author
Teschner, Detre1, Author              
Weinberg, Gisela1, Author              
Wild, Ute1, Author              
Knop-Gericke, Axel1, Author              
Ressler, Thorsten1, Author              
Grin, Yuri2, Author
Schlögl, Robert1, Author              
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
2Max Planck Society, ou_persistent13              

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Free keywords: intermetallic compounds; PdGa; Pd3Ga7; active-site isolation; chemical etching; palladium; gallium; selective hydrogenation; acetylene; in situ XPS. Pd intermetallic compounds
 Abstract: The structurally ordered intermetallic compounds PdGa and Pd3Ga7 constitute highly selective catalysts for the selective semi-hydrogenation of acetylene. The milling of assynthesized samples, followed by etching with ammonia solution increased the activity of the catalysts by factor of 90. Chemically etched samples possess high activity and simultaneously keep their high selectivity. Chemical analysis confirms that the etching procedure is mostly specific to gallium species, thus less affecting the palladium. Detailed investigations reveal the influence of the chemical etching on the morphology and surface of the particles. As a result of the etching, nano-caverns are formed (SEM and BET), and the surface is enriched in palladium (XPS and EDX), while the bulk crystal structure is not affected (XRD). The mechanism and applicability of the etching procedure is discussed in view of the active-site isolation concept.

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Language(s): eng - English
 Dates: 2009
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 412513
DOI: 10.1016/j.jcat.2009.03.007
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Title: Journal of Catalysis
  Alternative Title : J. Catal.
Source Genre: Journal
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Pages: - Volume / Issue: 264 (2) Sequence Number: - Start / End Page: 93 - 103 Identifier: -