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PtRu colloidal catalysts: Characterisation and determination of kinetics for methanol oxidation |
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| Authors: | T. Vidakovi?,K. Sundmacher,K.S. Nagabhushana,W. Fei,H. Bö nnemann |
| Affiliation: | a Max Planck Institute for Dynamics of Complex Technical Systems, Sandtorstrasse 1, D-39106 Magdeburg, Germany b University of Chemical Technology and Metallurgy, Department of Physical Chemistry, 1756 Sofia, Bulgaria c Otto-von-Guericke University Magdeburg, Process Systems Engineering, Universitätsplatz 2, D-39106 Magdeburg, Germany d Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz-1, D-45470 Mülheim an der Ruhr, Germany e Forschungszentrum Karlsruhe, ITC-CPV, Postfach 3640, D-76021 Karlsruhe, Germany |
| Abstract: | The activities of three 30 wt.% PtRu/C catalysts of the same nominal composition (Pt:Ru, 1:1 a/o) were investigated with regard to methanol oxidation. The catalysts were synthesized by Bönnemann's colloidal precursor method using different metal salt precursors and reducing agents. The catalysts were characterized ex situ by energy dispersive X-ray analysis (EDX) and X-ray diffraction (XRD) and in situ CO stripping and cyclic voltammetry. The activity towards methanol electro-oxidation was checked in steady-state experiments at 22 and 60 °C. The experimental rate data can be described well by a kinetic model, which includes methanol adsorption on the Pt-sites, formation of C-containing adsorbed species, OHads formation on the Ru sites and heterogeneous surface reaction between C-adsorbate and OHads. The kinetic model parameters were identified from the experimental data and were used to explain the differences in catalytic activity. |
| Keywords: | PtRu/Vulcan XC-72 Colloidal catalyst Methanol oxidation MEA Rate constants |
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