Stuttgart 2012 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 5: Niedertemperaturplasmen

P 5.7: Vortrag

Montag, 12. März 2012, 15:30–15:45, V57.03

Influence of Water on the Conversion of Methane and Carbon Dioxide in a Plug Flow Reactor Supported by a DBD — •Torsten Kolb and Karl-Heinz Gericke — Institut für Physikalische und Theoretsiche Chemie, Braunschweig, Germany

The conversion of methane and carbon dioxide was studied in a plug flow reactor with a dielectric barrier discharge. A 13.56 MHz power supply generated the atmospheric plasma discharge. Studied concentra-tion of methane ranged from 0 to 100%, with missing part filled up with carbon dioxide. This mixture was diluted with helium partly bubbling through a water tank to 2.5% at a flow rate of 200 sccm. The amount of water was adjusted between 0 and 0.6%. A small part of the product stream was monitored online at a total pressure of 100 mbar by a Fourier transform infrared spectrometer supported by a White-cell and a quadrupole mass spectrometer. This DBD reactor produces hydrogen, carbon monoxide, C2 hydrocarbons, methanol and formaldehyde with synthesis gas being the major compound. There is a raise of the produced amount of hydrogen from 34% for the reaction without water to 58% if the flow consists of 0.6% water (composition of the undiluted stream: 80% methane and 20% CO2). The amount of carbon dioxide has a small influence on the added water. The generation of C2 hydrocarbons is nearly independent of added water. In contrast, the fraction of methanol increases by a factor of 4.7 with additional water.