TU Darmstadt / ULB / TUbiblio

Silver as acrolein hydrogenation catalyst: intricate effects of catalyst nature and reactant partial pressures

Bron, Michael ; Teschner, Detre ; Knop-Gericke, Axel ; Jentoft, Friederike C. ; Krohnert, Jutta ; Hohmeyer, Jens ; Volckmar, Claudia ; Steinhauer, Bernd ; Schlögl, Robert ; Claus, Peter :
Silver as acrolein hydrogenation catalyst: intricate effects of catalyst nature and reactant partial pressures.
[Online-Edition: http://dx.doi.org/10.1039/b701011g]
In: Physical Chemistry Chemical Physics, 9 (27) pp. 3559-3569.
[Artikel], (2007)

Offizielle URL: http://dx.doi.org/10.1039/b701011g

Kurzbeschreibung (Abstract)

The hydrogenation of acrolein over pure and supported silver has been investigated with a focus on the influence of catalyst structure and reaction pressure (mbar to 20 bar range) on activity and selectivity. An onset of formation of allyl alcohol beyond 100 mbar reaction pressure (at 250 °C) is ascribed to a change in adsorption geometry upon increasing coverage. Smaller silver particles (in the nanometer range), the proximity of a reducible oxide component as well as high pressure lead to enhanced allyl alcohol formation; the selectivity to the other main product propionaldehyde is reduced. The silver dispersion changed depending on the reaction pressure. Moreover, the presence of oxygen, most likely as subsurface oxygen, and the presence of defects are of paramount importance for the catalytic behaviour. The considerable changes of the silver catalysts under reaction conditions and the pressure dependence call for in situ measurements to establish true structure–activity/selectivity relationships for this system.

Typ des Eintrags: Artikel
Erschienen: 2007
Autor(en): Bron, Michael ; Teschner, Detre ; Knop-Gericke, Axel ; Jentoft, Friederike C. ; Krohnert, Jutta ; Hohmeyer, Jens ; Volckmar, Claudia ; Steinhauer, Bernd ; Schlögl, Robert ; Claus, Peter
Titel: Silver as acrolein hydrogenation catalyst: intricate effects of catalyst nature and reactant partial pressures
Sprache: Englisch
Kurzbeschreibung (Abstract):

The hydrogenation of acrolein over pure and supported silver has been investigated with a focus on the influence of catalyst structure and reaction pressure (mbar to 20 bar range) on activity and selectivity. An onset of formation of allyl alcohol beyond 100 mbar reaction pressure (at 250 °C) is ascribed to a change in adsorption geometry upon increasing coverage. Smaller silver particles (in the nanometer range), the proximity of a reducible oxide component as well as high pressure lead to enhanced allyl alcohol formation; the selectivity to the other main product propionaldehyde is reduced. The silver dispersion changed depending on the reaction pressure. Moreover, the presence of oxygen, most likely as subsurface oxygen, and the presence of defects are of paramount importance for the catalytic behaviour. The considerable changes of the silver catalysts under reaction conditions and the pressure dependence call for in situ measurements to establish true structure–activity/selectivity relationships for this system.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Physical Chemistry Chemical Physics
Band: 9
(Heft-)Nummer: 27
Fachbereich(e)/-gebiet(e): Fachbereich Chemie
Fachbereich Chemie > Technische Chemie > Technische Chemie II
Fachbereich Chemie > Technische Chemie
Hinterlegungsdatum: 20 Mär 2009 09:01
Offizielle URL: http://dx.doi.org/10.1039/b701011g
Zusätzliche Informationen:

First published on the web 30. Mai 2007

ID-Nummer: 10.1039/b701011g
Export:

Optionen (nur für Redakteure)

Eintrag anzeigen Eintrag anzeigen