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Employing Exfoliated Graphite as Novel Support Material for Heterogeneous Model Catalysts

preprint
submitted on 03.05.2019 and posted on 06.05.2019 by Moritz Wolf, Nico Fischer, Michael Claeys

The inert nature of graphitic samples allows for characterisation of rather isolated supported nanoparticles in model catalysts, as long as sufficiently large inter-particle distances are obtained. However, the low surface area of graphite and the little interaction with nanoparticles result in a challenging application of conventional preparation routes in practice. In the present study, a set of graphitic carbon materials was characterised in order to identify potential support materials for the preparation of model catalyst systems. Various sizes of well-defined Co3O4 nanoparticles were synthesised separately and supported onto exfoliated graphite powder, that is graphite after solvent-assisted exfoliation via ultrasonication resulting in thinner flakes with increased specific surface area. The developed model catalysts are ideally suited for sintering studies of isolated nano-sized cobaltous particles as the graphitic support material does not provide distinct metal-support interaction. Furthermore, the differently sized cobaltous particles in the various model systems render possible studies on structural dependencies of activity, selectivity, and deactivation in cobalt oxide or cobalt catalysed reactions.

History

Email Address of Submitting Author

moritz.wolf@uct.ac.za

Institution

Catalysis Institute and DST-NRF Centre of Excellence in Catalysis c*change, University of Cape Town

Country

South Africa

ORCID For Submitting Author

0000-0002-1326-5337

Declaration of Conflict of Interest

No conflict of interest

Version Notes

Version 1 (03.05.2019)

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