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  The catalytic properties of thin film Pd-rich GaPd2 in methanol steam reforming

Mayr, L., Lorenz, H., Armbrüster, M., Alarcón Villaseca, S., Luo, Y., Cardoso, R., et al. (2014). The catalytic properties of thin film Pd-rich GaPd2 in methanol steam reforming. Journal of Catalysis, 309, 231-240. doi:10.1016/j.jcat.2013.10.002.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0017-C218-C Version Permalink: http://hdl.handle.net/21.11116/0000-0002-A02F-5
Genre: Journal Article

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 Creators:
Mayr, Lukas1, Author
Lorenz, Harald1, Author
Armbrüster, Marc2, Author              
Alarcón Villaseca, Sebastián3, Author              
Luo, Yuan3, Author              
Cardoso, Raúl4, Author              
Burkhardt, Ulrich5, Author              
Zemlyanov, Dmitry1, Author
Haevecker, Michael1, Author
Blume, Raoul1, Author
Knop-Gericke, Axel1, Author
Klötzer, Bernhard1, Author
Penner, Simon1, Author
Affiliations:
1external, ou_persistent22              
2Marc Armbrüster, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863414              
3Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
4Raul Cardoso, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863420              
5Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863422              

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 Abstract: An unsupported Pd-rich GaPd2 sample in form of a thin film has been prepared by alternating layer deposition of Pd and Ga metal and was subsequently used as a structurally and chemically stable model system to clarify the catalytic properties of the unsupported intermetallic compound GaPd2 in methanol steam reforming (MSR). The sample revealed a slightly Pd-richer GaPd2 bulk composition of Ga28Pd72, as evidenced by EDX analysis, low-energy ion scattering, X-ray diffraction measurements, and depth profiling by in situ X-ray photoelectron spectroscopy. The latter additionally showed a high stability of GaPd2 both under methanol and oxidative methanol steam reforming conditions. No active redox chemistry of Ga species or other reaction-induced oxidative Ga surface segregation has been detected during catalytic MSR reaction. Corroborating these observations, corresponding catalytic experiments under methanol steam reforming conditions revealed only a, in comparison with elemental Pd, very small activity in methanol dehydrogenation (CO formation rate at maximum 0.019 mbar min(-1); 0.08 site(-1)-s(-1)). Unsupported thin film Pd-rich GaPd2 with the given surface and bulk stoichiometry must therefore be considered a poor methanol steam reforming/dehydrogenation catalyst. In oxidative steam reforming experiments, only total oxidation without significant H-2 formation has been observed. (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: 231 - 240 Identifier: ISSN: 0021-9517
CoNE: /journals/resource/954922645027