Dielectric Barrier Discharge


It consists of two metal electrodes, in which at least one is coated with a dielectric layer. Plasma gas flows in the gap. The discharge is ignited by means of a sinusoidal or pulsed power source. The gap is on the order of several mm and the plasma is generated through a succession of micro arcs, lasting for 10 – 100 ns and distributed randomly. These systems are used for many applications like surface cleaning, material functionalization, etc.

The conversion of methane and carbon dioxide in a DBD reactor have been tested according to the setup shown in figure 3. The main products are synthesis gas C2 hydrocarbons and oxygenated hydrocarbons, like methanol or formaldehyde. The reactor (Fig. 3, right) consists of a 15 cm long Duran glass cylinder with an inner diameter of 5.9 mm and an outer diameter of 8.0 mm. The inner working iron electrode with a diameter of 3.0 mm is fixed on the top by two glass frits and on the bottom by glass wool. The outer part of the glass body is covered over a length of 50 mm with a conductive silver varnish to create the outer grounded counter electrode. The outer electrode has over the whole length a slit of about one millimeter width to monitor the plasma. The plasma is generated by a 13.56 MHz radio frequency generator.

Figure 3 The experimental setup (left) and DBD reactor(right) (DOI:  10.1007/s11090-012-9411-y)

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