Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 29: Metal substrates: Adsorption of organic / bio molecules II

O 29.1: Vortrag

Dienstag, 27. März 2012, 10:30–10:45, MA 043

Adsorption of Dodecahydro-N-Ethylcarbazole and N-Ethylcarbacole on Pd(111) – An XPS study — •Hans-Jörg Drescher, Stefan Schernich, Karin Gotterbarm, Marek Sobota, Christian Papp, Jörg Libuda, and Hans-Peter Steinrück — Friedrich-Alexander-Universität Erlangen-Nürnberg

Hydrogen is a promising alternative energy carrier for CO₂-free vehicle propulsion. Applications are, however, hampered by serious deficiencies of conventional storage at high pressures and cryogenic temperatures. Recently, a promising concept was put forward making use of "Liquid Organic Hydrogen Carriers", which are regenerable chemical hydrogen storage compounds with high capacity. N-ethylcarbazole (NEC) has been identified as a highly attractive candidate, with hydrogen storage being performed through reversible hydrogenation to dodecahydro-N-ethylcarbazole (H₁₂-NEC), typically over oxide-supported Pt or Pd catalysts. This contribution covers in-situ high-resolution XPS studies identifying the main surface species and reaction intermediates on a Pd(111) surface upon adsorption and heating. The thermal stability of the reactants and intermediates gives valuable information on reaction, decomposition and catalyst deactivation mechanisms and provides better understanding of more complex model catalysts like palladium nanoparticles on an alumina substrate.

Financial support by the DFG within the Excellence Cluster Engineering of Advanced Materials, the DAAD, BMW, Fonds der Chemischen Industrie and the European Union is greatfully acknowledged.