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  Surface dynamics of the intermetallic catalyst Pd2Ga, Part II - Reactivity and stability in liquid-phase hydrogenation of phenylacetylene

Wowsnik, G., Teschner, D., Armbrüster, M., Kasatkin, I., Girgsdies, F., Grin, Y., et al. (2014). Surface dynamics of the intermetallic catalyst Pd2Ga, Part II - Reactivity and stability in liquid-phase hydrogenation of phenylacetylene. Journal of Catalysis, 309, 221-230. doi:10.1016/j.jcat.2013.09.018.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0017-C40E-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-28A2-5
Genre: Journal Article

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Wowsnik, Gregor1, Author
Teschner, Detre1, Author
Armbrüster, Marc2, Author              
Kasatkin, Igor1, Author
Girgsdies, Frank1, Author
Grin, Yuri3, Author              
Schlögl, Robert, Author
Behrens, Malte, Author
Affiliations:
1external, ou_persistent22              
2Marc Armbrüster, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863414              
3Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863413              

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 Abstract: The catalytic properties of unsupported Pd2Ga for the liquid-phase hydrogenation of phenylacetylene are investigated after different pre-treatments with focus on the stability of the catalyst during reaction. The surface of as-prepared Pd2Ga consists mainly on Pd and oxidized Ga species. Under the conditions of the liquid-phase hydrogenation of pheriylacetylene, the intermetallic surface cannot be reformed in situ by reduction of Ga oxide. After a reductive pre-treatment in 5% H-2/Ar at 400 C, an almost clean Pd2Ga surface can be obtained. Its hydrogenation activity is significantly lowered compared to elemental Pd, which is due to the intrinsic adsorption properties of the intermetallic surface. However, residues of H(2)0 or O2 lead to oxidation of this surface. Excluding these impurities, the decomposition can be suppressed. In this case, the bulk material of Pd2Ga gets cracked during phenylacetylene hydrogenation. The controlled modification of the crystal and the electronic structure of Pd by formation of the intermetallic compound Pd-2- Ga are accompanied with a decreased stability. (C) 2013 Elsevier Inc. All rights reserved.

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 Dates: 2014-01-01
 Publication Status: Published in print
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Title: Journal of Catalysis
Source Genre: Journal
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Publ. Info: San Diego, CA. : Academic Press
Pages: - Volume / Issue: 309 Sequence Number: - Start / End Page: 221 - 230 Identifier: ISSN: 0021-9517
CoNE: /journals/resource/954922645027