The Effect of Halomethane Impurities on Ozone Generation from Oxygen in DC Negative Corona Discharge

Abstract

The effect of the halomethanes CCl2FZ, CH2CIZ, CHCl3 and CCL on the production of ozone using oxygen feed gas in a negative corona discharge has been investigated experimentally. The fall in the product ozone yield was found to increase with increasing number of halogen atoms substituted in methane molecule. A detailed description of the role of these halogen species in the chemistry of the discharge is given.

Ozone generation in a negative corona discharge fed with N2O and O2

“…The existence of such a high yield of O − 2 cannot, however, be explained by any known rate constants. Therefore, we suggest that their signal was due to NO − produced via the fast process (2). At low flow rates the O − signal was reduced and NO − becomes the dominant anion [12].…”

“…We have recently reported the effect on net ozone production of introducing chemical compounds into a negative corona discharge fed by oxygen [1,2]. In CO 2 + O 2 mixtures, ozone concentrations in excess of those predicted by the Vasiljev-Eremin formula [1] were recorded; indeed, even in pure CO 2 gas, ozone concentrations of hundreds of ppm were observed.…”