A new approach to well-defined, stable and site-isolated catalysts
Kovnir, K.; Armbrüster, M.; Teschner, D.; Venkov, T.V.; Jentoft, F.C.; Knop-Gericke, A.; Grin, Yu.; Schlögl, R.; Kovnir, K.; Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany; Armbrüster, M.; Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany; Department of Inorganic Chemistry, Fritz-Haber-Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany;; Teschner, D.; Department of Inorganic Chemistry, Fritz-Haber-Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany; Venkov, T.V.; Department of Inorganic Chemistry, Fritz-Haber-Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany; Jentoft, F.C.; Department of Inorganic Chemistry, Fritz-Haber-Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany; Knop-Gericke, A.; Department of Inorganic Chemistry, Fritz-Haber-Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany; Grin, Yu.; Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany; Schlögl, R.; Department of Inorganic Chemistry, Fritz-Haber-Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany
Журнал:
Science and Technology of Advanced Materials
Дата:
2007-07-31
Аннотация:
A new concept to circumvent some of the problems that are hindering a rational metallic catalyst development is introduced. Investigation of conventional metal catalysts — which consist of supported metals, metal mixtures or alloys — is handicapped by the presence of a variety of active sites, their possible agglomeration, metal–support interactions as well as segregation of the components. In order to avoid most of the drawbacks, we employ well-defined, ordered and in-situ stable unsupported intermetallic compounds. Knowledge of the chemical bonding in the compounds and the defined neighbourhood of the active sites allows a rational approach to catalysts with excellent selectivity as well as long-term stability. The concept is demonstrated for the intermetallic compound PdGa, which is applied as catalyst for the selective hydrogenation of acetylene to ethylene.
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