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



  history
ID: 367620.0, Fritz-Haber-Institut / Inorganic Chemistry
The role of subsurface chemistry in palladium-catalyzed alkyne hydrogenation
Authors:Teschner, Detre; Borsodi, Janos; Wootsch, A; Revay, Zsolt; Szentmiklosi, Laszlo; Kiss, Zoltan; Hävecker, Michael; Schnörch, Peter; Knop-Gericke, Axel; Schlögl, Robert
Language:English
Research Context:Catalytic Hydrogenation
Name of Conference/Meeting:14th International Congress on Catalysis
Place of Conference/Meeting:Seoul, Korea
(Start) Date of Event 
 (YYYY-MM-DD):
2008-07-13
End Date of Conference/Meeting 
 (YYYY-MM-DD):
2008-07-18
Audience:Experts Only
Abstract / Description:Alkynes can be selectively hydrogenated on palladium catalysts. This process requires however a strong modification of the near-surface region of Pd, in which carbon (autocatalytically fragmented feed molecules) occupies interstitial lattice sites. We have developed a new, in situ Prompt Gamma Activation Analysis (PGAA) technique, which allows us to perform nondestructive elemental analysis (and in particular the quantification of absorbed hydrogen in palladium) during catalytic reaction. By the help of PGAA, we conclude that unselective hydrogenation of alkynes proceeds on hydrogen saturated beta-hydride, while selective hydrogenation was only possible after decoupling bulk properties from the surface events. This latter was possible after carbon dissolved in the top few palladium layers and ceased the equilibrium between surface, subsurface and bulk-dissolved hydrogen. The modified electronic structure of Pd and the inhibition of subsurface hydrogen participating in alkyne hydrogenation rendered the reaction selective.
Free Keywords:Palladium, Selective hydrogenation, PGAA.
Last Change of the Resource (YYYY-MM-DD):2008-06-30
Document Type:Poster
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
Fritz-Haber-Institut/Inorganic Chemistry/Surface Analysis
External Affiliations:Institute of Isotopes, Hung. Acad. Sci., POB 77, Budapest, H-1525, Hungary
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