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

Mayr, L., Lorenz, H., Armbrüster, M., Villaseca, S. A., 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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Thin film GaPd2_penner_revised_2_all black.pdf (beliebiger Volltext), 171KB
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Thin film GaPd2_penner_revised_2_all black.pdf
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2014
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Elsevier
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 Urheber:
Mayr, Lukas1, Autor
Lorenz, Harald1, Autor
Armbrüster, Marc2, Autor
Villaseca, Sebastian Alarcon2, Autor
Luo, Yuan2, Autor
Cardoso, Raúl2, Autor
Burkhardt, Ulrich2, Autor
Zemlyanov, Dimitry3, Autor
Hävecker, Michael4, Autor           
Blume, Raoul4, Autor           
Knop-Gericke, Axel4, Autor           
Klötzer, Bernhard1, Autor
Penner, Simon1, Autor
Affiliations:
1Institute of Physical Chemistry, University of Innsbruck, A-6020 Innsbruck, Austria, ou_persistent22              
2Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany, ou_persistent22              
3Purdue University, Birck Nanotechnology Center, 1205 West State Street, West Lafayette, IN 47907-2057, USA, ou_persistent22              
4Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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 Zusammenfassung: 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 H2 formation has been observed.

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Sprache(n): eng - English
 Datum: 2013-05-102013-10-052013-10-052014-01
 Publikationsstatus: Erschienen
 Seiten: 10
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1016/j.jcat.2013.10.002
 Art des Abschluß: -

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Titel: Journal of Catalysis
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: San Diego, CA. : Academic Press
Seiten: - Band / Heft: 309 Artikelnummer: - Start- / Endseite: 231 - 240 Identifikator: ISSN: 0021-9517
CoNE: https://pure.mpg.de/cone/journals/resource/954922645027