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20 Sep 2004

Volume 85, Issue 12, pp. 2157-2437

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Appl. Phys. Lett. 85, 2390 (2004); http://dx.doi.org/10.1063/1.1796520 (3 pages)

Stas Polonsky and Alan Weger
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Combination of a pulsed microwave plasma with a catalyst for acetylene oxidation

A. Rousseau, O. Guaitella, J. Röpcke, L. V. Gatilova, and Y. A. Tolmachev

Appl. Phys. Lett. 85, 2199 (2004); http://dx.doi.org/10.1063/1.1785280 (3 pages) | Cited 5 times

Online Publication Date: 24 September 2004

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The potential of an approach combining a pulsed microwave discharge with a catalytic packed bed reactor for the oxidation of volatile organic compounds (VOC) has been studied. The ignition of the plasma has been made possible by inserting ferroelectric BaTiO3 pellets inside the microwave excitator. As a test VOC molecule, acetylene (C2H2) in an amount of 200 ppm in dry air was used. The total oxidation products CO and CO2 have been monitored downstream of the plasma region by tuneable diode laser absorption spectroscopy in the infrared region. The oxidative efficiency was found to increase linearly with the pulse repetition rate. The oxidative efficiency and the CO2∕CO selectivity were considerably enhanced when the catalyst was located inside the plasma region, which shows the synergetic effect of the plasma–catalyst combination.
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52.80.Pi High-frequency and RF discharges
82.33.Xj Plasma reactions (including flowing afterglow and electric discharges)
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
81.65.Mq Oxidation

Stable plasma configurations in a cylindrical magnetron discharge

I. Levchenko, M. Romanov, M. Keidar, and I. I. Beilis

Appl. Phys. Lett. 85, 2202 (2004); http://dx.doi.org/10.1063/1.1792795 (3 pages) | Cited 15 times

Online Publication Date: 24 September 2004

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Transition between different plasma configurations is studied in a system with negative biased cylindrical target in crossed E×B fields. It was found that the diffuse plasma torus formed around the cylindrical target in relatively small magnetic field (0.02 T on target surface) changes the shape with magnetic field to form a thin disk with a width lower than 1 cm when target voltage is less than −400 V. The target current decreases sharply when the magnetic field reaches some critical value. When the target voltage exceeds 400 V, the target current increases with the magnetic field and the plasma has always toroidal shape. The plasma behavior can be understood taking in account the interaction of the drift currents and the magnetic field.
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52.80.-s Electric discharges
52.25.Fi Transport properties
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