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

ID: 319051.1, Fritz-Haber-Institut / Inorganic Chemistry
Silver as acrolein hydrogenation catalyst: intricate effects of catalyst nature and reactant partial pressures
Authors:Bron, Michael; Teschner, Detre; Knop-Gericke, Axel; Jentoft, Friederike C.; Kröhnert, Jutta; Hohmeyer, Jens; Volckmar, Claudia; Steinhauer, Bernd; Schlögl, Robert; Claus, Peter
Research Context:Silver in hydrogenation
Date of Publication (YYYY-MM-DD):2007-05-30
Title of Journal:Physical Chemistry Chemical Physics
Journal Abbrev.:PCCP
Issue / Number:27
Start Page:3559
End Page:3569
Copyright:RSC Publishing
Review Status:not specified
Audience:Experts Only
Abstract / Description: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 1C) 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.
Free Keywords:Ag, silver, acrolein, selectivity
Last Change of the Resource (YYYY-MM-DD):2006-04-04
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Functional Characterization
Fritz-Haber-Institut/Inorganic Chemistry/Surface Analysis
Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
External Affiliations:Ernst-Berl-Institut / TC II, TU Darmstadt, Petersenstr. 20, 64287 Darmstadt
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