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  The Role of Adsorbed and Subsurface Carbon Species for the Selective Alkyne Hydrogenation Over a Pd-Black Catalyst: An Operando Study of Bulk and Surface

Velasco Vélez, J., Teschner, D., Girgsdies, F., Hävecker, M., Streibel, V., Willinger, M. G., et al. (2018). The Role of Adsorbed and Subsurface Carbon Species for the Selective Alkyne Hydrogenation Over a Pd-Black Catalyst: An Operando Study of Bulk and Surface. Topics in Catalysis, 61(20), 2052-2061. doi:10.1007/s11244-018-1071-6.

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Velasco-Vélez2018_Article_TheRoleOfAdsorbedAndSubsurface.pdf (Publisher version), 3MB
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Velasco-Vélez2018_Article_TheRoleOfAdsorbedAndSubsurface.pdf
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 Creators:
Velasco Vélez, Juan1, 2, Author           
Teschner, Detre1, 2, Author           
Girgsdies, Frank1, Author           
Hävecker, Michael1, 2, Author           
Streibel, Verena1, Author           
Willinger, Marc Georg1, Author           
Cao, Jing1, Author           
Lamoth, Maximilian1, Author           
Frei, Elias1, Author           
Wang, R.3, Author
Centeno, A.4, Author
Zurutuza, A.4, Author
Hofmann, S.3, Author
Schlögl, Robert1, 2, Author           
Knop-Gericke, Axel1, 2, Author           
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
2Department of Heterogeneous Reactions, Max-Planck-Institute for Chemical Energy Conversion, ou_persistent22              
3Department of Engineering, University of Cambridge, Cambridge CB3 0FA, UK, ou_persistent22              
4Graphenea, 20018 San Sebastian, Spain, ou_persistent22              

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 Abstract: The selective hydrogenation of propyne over a Pd-black model catalyst was investigated under operando conditions at 1 bar
making use of advanced X-ray diffraction (bulk sensitive) and photo-electron spectroscopy (surface sensitive) techniques. It was found that the population of subsurface species controls the selective catalytic semi-hydrogenation of propyne to pro-pylene due to the formation of surface and near-surface PdCx
that inhibits the participation of more reactive bulk hydrogen in the hydrogenation reaction. However, increasing the partial pressure of hydrogen reduces the population of PdCx with the concomitant formation of a β-PdHx phase up to the surface, which is accompanied by a lattice expansion, allowing the participation of more active bulk hydrogen which is responsible for the unselective total alkyne hydrogenation. Therefore, controlling the surface and subsurface catalyst chemistry is crucial to control the selective alkyne semi-hydrogenation.

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Language(s): eng - English
 Dates: 2018-10-242018-12
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1007/s11244-018-1071-6
 Degree: -

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Title: Topics in Catalysis
  Other : Top. Catal.
Source Genre: Journal
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Publ. Info: New York : Springer
Pages: 10 Volume / Issue: 61 (20) Sequence Number: - Start / End Page: 2052 - 2061 Identifier: ISSN: 1022-5528
CoNE: https://pure.mpg.de/cone/journals/resource/954925584249