Removal of NO and Formation of Byproducts in a Positive-Pulsed Corona Discharge Reactor

Abstract

The effect of feed gas composition on the removal of NO and the formation of byproducts in a positive-pulsed corona discharge reactor were experimentally examined. The mechanism for the removal of NO was found to largely depend on the gas composition. In the absence of oxygen, most of the NO removed was reduced to N 2 ; on the other hand, the oxidation of NO to NO 2 was dominant when oxygen was present although the content was low. The removal of NO decreased with the water vapor content due to the decreases in the power delivery and the formation of ozone. The production of N 2 O increased with the pulse repetition rate, and the presence of NH 3 and SO 2 enhanced it. Byproducts generated from propene used as additive were identified and analyzed. The main byproducts other than carbon oxides were found to be ethane and formaldehyde, but their concentrations were negligibly small.

The Effect of Oxygen and Water Vapor on Nitric Oxide Conversion with a Dielectric Barrier Discharge Reactor

“…Yamamoto [16], Mclarnon [17], and Mok [18] reached a similar conclusion. The increased oxygen content, however, increased the generation rate of NO 2 , as shown in Fig.…”

Abatement of Trichloromethane by Using Nonthermal Plasma Reactors

“…In both reactors, NO was not detected at all oxygen contents explored. As well known, NO formed by reactions (8) and (9) is oxidized to NO 2 by O and O 3 [23][24][25]. Besides, the intermediates such as CHCl 2 and CCl 3 formed by reactions (1)-(5) can also take part in the oxidation of NO to NO 2 in the presence of oxygen.…”

Effects of CH4 and CO on the Reduction of Nitric Oxide to Nitrogen in a Discharge Reactor

“…N 2 O decomposed easily because of the weak N-O bond (D 0 ϭ 161.3 kJ/mol) into N 2 and O resulting in the rapid disappearance of N 2 O, especially with the greater applied power accompanying the higher plasma density. 23 Although NO 2 is usually the major final product in the nonthermal plasma regardless of whether or not there is CH 4 addition, 18,19,24 the concentration of NO 2 was under the detection limit for all of the test runs in this rf conversion process. Maybe the reaction of NO ϩ O 3 NO 2 could not proceed very fast, 25 as well as NO 2 being redissociated because of its weaker binding energies after it is formed.…”