In situ-XAS and catalytic study of acrolein hydrogenation over silver catalyst: Control of intramolecular selectivity by the pressure

The gas phase hydrogenation of acrolein over 7.5% Ag/SiO 2 has been studied in a broad pressure range from 7.5 mbar to 20 bar. Higher pressures favour the formation of allyl alcohol (selectivities up to 42%), whereas at low pressures propionaldehyde is by far the main product. In situ-XAS has been p...

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Bibliographic Details
Published in:Catalysis communications 2005-05, Vol.6 (5), p.371-374
Main Authors: Bron, Michael, Teschner, Detre, Knop-Gericke, Axel, Scheybal, Andreas, Steinhauer, Bernd, Hävecker, Michael, Födisch, Ringo, Hönicke, Dieter, Schlögl, Robert, Claus, Peter
Format: Article
Language:English
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Summary:The gas phase hydrogenation of acrolein over 7.5% Ag/SiO 2 has been studied in a broad pressure range from 7.5 mbar to 20 bar. Higher pressures favour the formation of allyl alcohol (selectivities up to 42%), whereas at low pressures propionaldehyde is by far the main product. In situ-XAS has been performed at 7.5 mbar in order to gain insight into the interaction of acrolein with Ag(1 1 1). Hydrogenated propionaldehyde-like surface species could be detected which orientated parallel to the surface. The observed intermediate correlates perfectly with the online catalytic data.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2005.02.013