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P: Fachverband Plasmaphysik

P 16: Atmospheric Pressure Plasmas and their Applications III

P 16.5: Vortrag

Mittwoch, 28. Februar 2024, 15:15–15:30, WW 1: HS

Enhancing CO₂ Conversion and Oxygen Separation Performance by Optimizing the Gas Flow of an Atmospheric Plasma Torch — •Katharina Wiegers, Stefan Merli, Marc Bresser, Andreas Schulz, Matthias Walker, and Günter Tovar — IGVP, University of Stuttgart, Stuttgart, Germany

The chemical industry needs to switch from processes that use fossil raw materials to renewable sources. Carbon dioxide (CO₂) is the base product for closing the carbon cycle. One possibility to convert CO₂ is through a plasma process at atmospheric pressure that splits CO₂ into carbon monoxide (CO) and oxygen (O₂). Since out of the two products, only CO is needed for industrial purposes, a gas separation step is required. By using oxygen-conducting ceramic hollow fiber membranes, oxygen can be removed from the product gas in situ. A promising candidate for the membrane material is La_0.6Ca_0.4C_0.5Fe_0.5O₃, which results in fibers with a high thermal stability of up to 1200^∘C inside CO₂ plasma. Moreover, the amount of produced CO can be further increased by improving the quenching of unwanted back reactions. This can be achieved by optimizing the gas management by introducing a restriction in the flow regime. Therefore, a nozzle has been designed with the aim to improve the quenching effect and, at the same time, increase the volume of the plasma interacting with the membranes and thus the amount of O₂ removed. The O₂ permeation in the fiber could thus be increased from 2.2 to 4.6 mL · min⁻¹.

Keywords: CO$_{2}$ Plasma; Conversion; Oxygen Separation; Gas Management