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          Institute: Fritz-Haber-Institut     Collection: Inorganic Chemistry     Display Documents

ID: 412513.0, Fritz-Haber-Institut / Inorganic Chemistry
Etching of the Intermetallic Compounds PdGa and Pd3Ga7: An Effective Way to Increase Catalytic Activity?
Authors:Kovnir, Kirill; Osswald, Jürgen; Armbrüster, Marc; Teschner, Detre; Weinberg, Gisela; Wild, Ute; Knop-Gericke, Axel; Ressler, Thorsten; Grin, Yuri; Schlögl, Robert
Research Context:Pd intermetallic compounds
Date of Publication (YYYY-MM-DD):2009
Title of Journal:Journal of Catalysis
Journal Abbrev.:J. Catal.
Issue / Number:2
Start Page:93
End Page:103
Copyright:© 2009 Elsevier Ltd All rights reserved.
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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.
Free Keywords:intermetallic compounds; PdGa; Pd3Ga7; active-site isolation; chemical etching; palladium; gallium; selective hydrogenation; acetylene; in situ XPS.
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Preparation
Fritz-Haber-Institut/Inorganic Chemistry/Micro- and Nanostructure / Carbon
MPI für chemische Physik fester Stoffe
Fritz-Haber-Institut/Inorganic Chemistry/Electronic Structure and Adsorption / Metals
Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
External Affiliations:Institute of Chemistry, Technical University Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
Identifiers:URL:http://dx.doi.org/10.1016/j.jcat.2009.03.007 [only for subscriber]
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