Size and structure effects controlling the stability of the liquid organic hydrogen carrier dodecahydro- N -ethylcarbazole during dehydrogenation over pt model catalysts

Journal article
(Original article)


Publication Details

Author(s): Amende M, Gleichweit C, Schernich S, Höfert O, Lorenz MPA, Zhao W, Koch M, Obesser K, Papp C, Wasserscheid P, Steinrück HP, Libuda J
Journal: Journal of Physical Chemistry Letters
Publisher: American Chemical Society
Publication year: 2014
Volume: 5
Journal issue: 8
Pages range: 1498-1504
ISSN: 1948-7185


Abstract


Hydrogen can be stored conveniently using so-called liquid organic hydrogen carriers (LOHCs), for example, N-ethylcarbazole (NEC), which can be reversibly hydrogenated to dodecahydro-N-ethylcarbazole (H-NEC). In this study, we focus on the dealkylation of H-NEC, an undesired side reaction, which competes with dehydrogenation. The structural sensivity of dealkylation was studied by high-resolution X-ray photoelectron spectroscopy (HR-XPS) on AlO-supported Pt model catalysts and Pt(111) single crystals. We show that the morphology of the Pt deposit strongly influences LOHC degradation via C-N bond breakage. On smaller, defect-rich Pt particles, the onset of dealkylation is shifted by 90 K to lower temperatures as compared to large, well-shaped particles and well-ordered Pt(111). We attribute these effects to a reduced activation barrier for C-N bond breakage at low-coordinated Pt sites, which are abundant on small Pt aggregates but are rare on large particles and single crystal surfaces. © 2014 American Chemical Society.



FAU Authors / FAU Editors

Amende, Maximilian
Gleichweit, Christoph
Lehrstuhl für Physikalische Chemie II
Lehrstuhl für Physikalische Chemie II
Höfert, Oliver
Lehrstuhl für Physikalische Chemie II
Koch, Marcus
Lehrstuhl für Chemische Reaktionstechnik
Libuda, Jörg Prof. Dr.
Professur für Physikalische Chemie
Obesser, Katharina
Lehrstuhl für Chemische Reaktionstechnik
Papp, Christian PD Dr.
Lehrstuhl für Physikalische Chemie II
Schernich, Stefan
Professur für Physikalische Chemie
Steinrück, Hans-Peter Prof. Dr.
Lehrstuhl für Physikalische Chemie II
Wasserscheid, Peter Prof. Dr.
Lehrstuhl für Chemische Reaktionstechnik
Zhao, Wei
Lehrstuhl für Physikalische Chemie II


Additional Organisation
Exzellenz-Cluster Engineering of Advanced Materials


How to cite

APA:
Amende, M., Gleichweit, C., Schernich, S., Höfert, O., Lorenz, M.P.A., Zhao, W.,... Libuda, J. (2014). Size and structure effects controlling the stability of the liquid organic hydrogen carrier dodecahydro- N -ethylcarbazole during dehydrogenation over pt model catalysts. Journal of Physical Chemistry Letters, 5(8), 1498-1504. https://dx.doi.org/10.1021/jz500157r

MLA:
Amende, Maximilian, et al. "Size and structure effects controlling the stability of the liquid organic hydrogen carrier dodecahydro- N -ethylcarbazole during dehydrogenation over pt model catalysts." Journal of Physical Chemistry Letters 5.8 (2014): 1498-1504.

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Last updated on 2019-07-04 at 14:50

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