English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

The Roles of Subsurface Carbon and Hydrogen in Palladium-Catalyzed Alkyne Hydrogenation

MPS-Authors
/persons/resource/persons22163

Teschner,  Detre
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons21396

Borsodi,  Janos
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons21590

Hävecker,  Michael
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons21743

Knop-Gericke,  Axel
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons22071

Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

External Ressource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Teschner, D., Borsodi, J., Wootsch, A., Revay, Z., Hävecker, M., Knop-Gericke, A., et al. (2008). The Roles of Subsurface Carbon and Hydrogen in Palladium-Catalyzed Alkyne Hydrogenation. Science, 320(5872), 86-89. doi:10.1126/science.1155200.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-FD21-0
Abstract
Alkynes can be selectively hydrogenated to alkenes on solid palladium catalysts. This process requires a strong modification of the near-surface region of Pd, in which carbon (from fragmented feed molecules) occupies interstitial lattice sites. In situ x-ray photoelectron spectroscopic measurements under reaction conditions indicate that much less carbon is dissolved in Pd during unselective, total hydrogenation. Additional studies of hydrogen content with in situ prompt gamma activation analysis, which allows us to follow the hydrogen content of Pd during catalysis, indicate that unselective hydrogenation proceeds on hydrogen-saturated -hydride, whereas selective hydrogenation was only possible after decoupling bulk properties from the surface events. Thus the population of subsurface sites of Pd, either by hydrogen or by carbon, governs the hydrogenation events on the surface.