Surface Reactions of Dicyclohexylmethane on Pt(111)

Gleichweit C, Amende M, Höfert O, Xu T, Späth F, Brückner N, Wasserscheid P, Libuda J, Steinrück HP, Papp C (2015)


Publication Status: Published

Publication Type: Journal article

Publication year: 2015

Journal

Publisher: American Chemical Society

Book Volume: 119

Pages Range: 20299-20311

DOI: 10.1021/acs.jpcc.5b06178

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.

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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.

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