Decomposition of N₂O by Microwave Discharge of N₂O/He or N₂O/Ar Mixtures

Abstract

The decomposition of N2O into N2, O2 and NO by a microwave discharge of N2O/He or N2O/Ar mixtures was studied at various total pressures. Although discharge could be maintained only in the low total-pressure range of 1–80 Torr in N2O/He mixtures at N2O and He flow rates of 25 and 2000 sccm, respectively, stable microwave discharge could be maintained in the wide total-pressure range of 1–760 Torr in N2O/Ar mixtures at N2O and Ar flow rates of 25 and 1000 sccm, respectively, at a microwave power of 200 W. The decomposition efficiency of N2O and the branching ratios of products in N2O/Ar mixtures at 760 Torr were measured as a function of the microwave power or the N2O flow ratio at a relatively high N2O concentration range of 9900–47600 ppm. The decomposition mechanism of N2O in the He and Ar discharges is discussed on the basis of mass spectrometric and optical emission spectroscopic data.

Photochemical removal of NO2 by using 172-nm Xe2 excimer lamp in N2 or air at atmospheric pressure

“…Removal of NOx was also studied by using pulsed corona discharge [6][7][8][9][10][11][12][13] and microwave discharge methods [14][15][16][17][18][19][20][21][22][23]. Discharge methods will become a low cost convenient method, if NOx can be removed without using any catalysts and reducing agents.…”

Photochemical Removal of N2O in N2 or Air Using 172 nm Excimer Lamps

“…Removal of N 2 O has been studied using pulsed corona discharge and microwave discharge methods. [7][8][9][10][11][12][13][14] In our previous study using microwave discharge without any catalysts, N 2 O could be efficiently decomposed into N 2 and O 2 in N 2 at atmospheric pressure. 9) However, when N 2 O diluted in N 2 /O 2 mixtures was decomposed by microwave discharge, a large amount of NO was emitted owing to discharge reactions of buffer N 2 and O 2 gases.…”

Microwave-assisted catalytic decomposition of N2O over hexaferrites

“…The use of microwave discharge can offer a unique way to assist catalytic reactions [7,8]. Limited number of study is devoted to the N 2 O decomposition by using microwave discharge [9][10][11][12][13]. Rare gas and external electrodes were used to maintain the stable discharge at atmospheric pressure.…”