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Silver as Acrolein Hydrogenation Catalyst: Intricate Effects of Catalyst Nature and Reactant Partial Pressures

Silver as Acrolein Hydrogenation Catalyst: Intricate Effects of Catalyst Nature and Reactant Partial Pressures

Michael Bron, Detre Teschner, Axel Knop-Gericke, Friederike C Jentoft, Jutta Kröhnert, Jens Hohmeyer, Claudia Volckmar, Bernd Steinhauer, Robert Schlögl, Peter Claus

Phys Chem Chem Phys. 2007 Jul 21;9(27):3559-69.

PMID: 17612721

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 degrees 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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS71403	Silver, dispersion			Price

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