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  Supports and modified nano-particles for designing model catalysts

O'Brien, C. P., Dostert, K.-H., Hollerer, M., Stiehler, C., Calaza, F., Schauermann, S., et al. (2016). Supports and modified nano-particles for designing model catalysts. Faraday Discussions, 188, 309-321. doi:10.1039/c5fd00143a.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-FB36-E Version Permalink: http://hdl.handle.net/21.11116/0000-0003-2EE1-C
Genre: Journal Article

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 Creators:
O'Brien, C. P. 1, Author
Dostert, Karl-Heinz2, Author              
Hollerer, M. 3, Author
Stiehler, Christian2, Author              
Calaza, Florencia2, Author              
Schauermann, Swetlana2, 4, Author              
Shaikhutdinov, Shamil K.2, Author              
Sterrer, M.3, Author
Freund, Hans-Joachim2, Author              
Affiliations:
1US Army Research Laboratory, USA, ou_persistent22              
2Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              
3Institute of Physics, University of Graz, Austria , ou_persistent22              
4Institut für Physikalische Chemie, Christian-Albrechts-Universität zu Kiel, Germany , ou_persistent22              

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 Abstract: In order to design catalytic materials, we need to understand the essential causes for material properties resulting from its composite nature. In this paper we discuss two, at first sight, diverse aspects: (a) the effect of the oxide–metal interface on metal nanoparticle properties and (b) the consequences of metal particle modification after activation on the selectivity of hydrogenation reactions. However, these two aspects are intimately linked. The metal nanoparticle’s electronic structure changes at the interface as a catalyst is brought to different reaction temperatures due to morphological modifications in the metal and, as we will discuss, these changes in the chemistry lead to changes in the reaction path. As the morphology of the particle varies, facets of different orientations and sizes are exposed, which may lead to a change in the surface chemistry as well. We use two specific reactions to address these issues in some detail. To the best of our knowledge, the present paper reports the first observations of this kind for well-defined model systems. The changes in the electronic structure of Au nanoparticles due to their size and interaction with a supporting oxide are revealed as a function of temperature using CO2 activation as a probe. The presence of spectator species (oxopropyl), formed during an activation step of acrolein hydrogenation, strongly controls the selectivity of the reaction towards hydrogenation of the unsaturated C=O bond vs. the C=C bond on Pd(111) when compared with oxide-supported Pd nanoparticles.

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Language(s): eng - English
 Dates: 2015-10-092015-10-212015-10-222016-07-01
 Publication Status: Published in print
 Pages: 13
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1039/c5fd00143a
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Title: Faraday Discussions
  Abbreviation : Faraday Discuss.
Source Genre: Journal
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Publ. Info: London : Royal Society of Chemistry
Pages: 13 Volume / Issue: 188 Sequence Number: - Start / End Page: 309 - 321 Identifier: ISSN: 1359-6640
CoNE: /journals/resource/954925269326