Jena 2013 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 12: Plasmadiagnostik II

P 12.1: Vortrag

Donnerstag, 28. Februar 2013, 11:15–11:30, HS 2

CO₂ dissociation mechanisms in atmospheric pressure dielectric barrier discharges — •F. Brehmer^1,2, S. Welzel¹, S. Ponduri¹, M.C.M. van de Sanden^1,3, and R. Engeln¹ — ¹Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands — ²AFS GmbH, Von-Holzapfel-Straße 10, 86497 Horgau, Germany — ³Dutch Institute for Fundamental Energy Research (DIFFER), P.O. Box 1207, 3430 BE Nieuwegein, The Netherlands

In any scenario for storing renewable energy in value-added hydrocarbons produced from CO₂, the dissociation into CO is known as the process limiting step. To surpass the drawbacks observed for conventional production routes, non-equilibrium plasma processing is considered as an alternative approach. We report on an atmospheric pressure plasma process for the dissociation of CO₂ using a dielectric barrier discharge, which was specifically designed in parallel plate configuration to facilitate optical diagnostics.

A careful electrical characterization was carried out to specify the energy efficiency of the flow-tube. The dissociation of CO₂ to CO and by-products was studied using infrared absorption spectroscopy (ex-situ and in-situ). The conversion efficiency of the order of a few percent turned out to be mainly determined by electron impact excitation and ionization. These reaction channels were concluded from complementary time resolved emission spectroscopy and Thomson scattering experiments.