| 摘要 |
A method for cleaning exhaust air containing pollutants, especially gaseous hydrocarbon emissions in an exhaust duct, using a catalyst and a UV radiation raising the energy level of the hydrocarbons, in which the exhaust air is exposed in a first section of the air duct to UV-C radiation of a wavelength of below 300 nm, preferably of about 254 nm, which causes an excitation of the hydrocarbons to higher energy levels, and also to a UV-C radiation of a wavelength preferably of about 185 nm, which additionally causes the formation of ozone, and of molecular oxygen and radicals from the ozone, while a partial oxidation of the hydrocarbon molecules takes place in the gas phase, and in that in a following second section of the air duct a catalytic oxidation of the hydrocarbon molecules is performed at the inner surface of a porous support material, the hydrocarbon molecules being absorbed, then oxidized on the active surface by the additionally formed ozone and removed from the surface of the catalyst in the form of H2O and CO2 as reaction products.
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