Purification of oxygen-containing gases contaminated with organic particulates, e.g. bacteria, pollen,or odors, comprises treatment with cold plasma of free radicals and oxidizing molecules produced by silent electric discharge

摘要

Oxidative purification of oxygen-containing gases, e.g. air, comprises cold plasma treatment with free radicals and oxidizing molecules produced by silent electric discharge from a dielectric device with an internal electrode comprising electrically conductive fibres. An independent claim is included for a device for cold plasma treatment of oxygen-containing gases by application of high frequency alternating voltage to a single or fan electrode and conductive fiber packing. The device typically comprises a carrier envelope of lime-soda glass, 6-8 mm diameter and 6-12 mm length, with a wall thickness of 0.8-1.2 mm, containing a conductive packing, e.g. stainless steel wool of 0.01-0.04 mm diameter fiber, and surrounded by an external grid electrode of 1.4-2.1 mm diameter conductors, to which is applied a smoothed 25 kHz potential of 1400-1700 V. At least one of the two electrodes is rigid and porous, or is arranged so that there is a gas flow gap between the dielectric and the electrode.