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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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 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: https://pure.mpg.de/cone/journals/resource/954922645027