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Pd-C surface phase as an essential parameter of selective alkyne hydrogenation: a high-pressure XPS study

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

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Vass,  Elaine M.
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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

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Zafeiratos,  Spiros
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schnörch,  Peter
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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

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

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Citation

Teschner, D., Vass, E. M., Hävecker, M., Zafeiratos, S., Schnörch, P., Knop-Gericke, A., et al. (2007). Pd-C surface phase as an essential parameter of selective alkyne hydrogenation: a high-pressure XPS study. Talk presented at Europacat VIII. Turku, Finnland. 2007-08-26 - 2007-08-31.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-FFFC-5
Abstract
Appropriate reaction selectivity is likely the biggest issue on the way to economically feasible industrial catalytic processes. Palladium particles are able to add one hydrogen molecule to both alkenes and alkynes, hence the question may arise how the catalyst prohibits total hydrogenation of alkynes and multiple unsaturated hydrocarbon. We investigated the hydrogenation of various alkenes and alkynes on palladium catalysts by catalytic reaction and high-pressure XPS experiments, and found that the active surface of selective alkyne hydrogenation consist of a Pd-C surface phase. Carbon embedded in the palladium lattice inhibits the emergence of bulk-dissolved hydrogen to the surface, which is reactive but unselective. Moreover, Pd-C does not build up from alkenes.