Surface Reactions of Dicyclohexylmethane on Pt(111)

Journal article


Publication Details

Author(s): Gleichweit C, Amende M, Höfert O, Xu T, Späth F, Brückner N, Wasserscheid P, Libuda J, Steinrück HP, Papp C
Journal: Journal of Physical Chemistry C
Publisher: American Chemical Society
Publication year: 2015
Volume: 119
Pages range: 20299-20311
ISSN: 1932-7447


Abstract


We investigated the surface reaction of the liquid organic hydrogen carrier dicydohexylmethane (DCHM) on Pt(111) in ultrahigh vacuum by high-resolution X-ray photoelectron spectroscopy, temperature-programmed desorption, near-edge X-ray absorption fine structure, and infrared reflection absorption spectroscopy. Additionally, the hydrogen-lean molecule diphenylmethane and the relevant molecular fragments of DCHM, methylcyclohexane, and toluene were studied to elucidate the reaction steps of DCHM. We find dehydrogenation of DCHM in the range of 200-260 K, to form a double-sided pi-allylic species coadsorbed with hydrogen. Subsequently, similar to 30% of the molecules desorb, and for similar to 70%, one of the pi-allyls reacts to a phenyl group between 260 and 330 K, accompanied by associative hydrogen desorption. Above 360 K, the second pi-allylic species is dehydrogenated to a phenyl ring. This is accompanied by C-H bond scission at the methylene group, which is an unwanted decomposition step in the hydrogen storage cycle, as it alters the original hydrogen carrier DCHM. Above 450 K, we find further decomposition steps which we assign to C-H abstraction at the phenyl rings.



FAU Authors / FAU Editors

Amende, Maximilian
Lehrstuhl für Physikalische Chemie II
Brückner, Nicole
Lehrstuhl für Chemische Reaktionstechnik
Gleichweit, Christoph
Lehrstuhl für Physikalische Chemie II
Höfert, Oliver
Lehrstuhl für Physikalische Chemie II
Libuda, Jörg Prof. Dr.
Professur für Physikalische Chemie
Papp, Christian PD Dr.
Lehrstuhl für Physikalische Chemie II
Späth, Florian
Lehrstuhl für Physikalische Chemie II
Steinrück, Hans-Peter Prof. Dr.
Lehrstuhl für Physikalische Chemie II
Wasserscheid, Peter Prof. Dr.
Lehrstuhl für Chemische Reaktionstechnik
Xu, Tao
Lehrstuhl für Physikalische Chemie II


Additional Organisation
Exzellenz-Cluster Engineering of Advanced Materials


How to cite

APA:
Gleichweit, C., Amende, M., Höfert, O., Xu, T., Späth, F., Brückner, N.,... Papp, C. (2015). Surface Reactions of Dicyclohexylmethane on Pt(111). Journal of Physical Chemistry C, 119, 20299-20311. https://dx.doi.org/10.1021/acs.jpcc.5b06178

MLA:
Gleichweit, Christoph, et al. "Surface Reactions of Dicyclohexylmethane on Pt(111)." Journal of Physical Chemistry C 119 (2015): 20299-20311.

BibTeX: 

Last updated on 2018-08-08 at 03:51

Share link