| 摘要 |
Ozone, which is produced as a waste gas during normal technical processes or as a result of accidents, must not, on account of its toxicity, be allowed to escape into the atmosphere, but must be disposed of. Known processes for disposal of ozone are incineration, filtering using activated charcoal and catalysis on mixed metal oxides. In the catalysis on mixed metal oxides, it is usually necessary to heat the catalyst. In addition it must be ensured that the catalyst is not poisoned by water and nitrogen oxides contained in the waste gas. However, nitrogen oxides are always formed in the production of ozone from air. The catalysis of ozone on mixed metal oxides is made considerably more difficult by these secondary conditions. To simplify this process, the ozone-containing gas mixture is first passed through a container of aluminosilicate, then through the reaction vessel containing mixed metal oxides and finally through a further container of aluminosilicate. By means of a four-way valve, the flow direction is changed at intervals. On flowing through the first container of aluminosilicate, nitrogen oxides and water are absorbed. In the reaction vessel, the ozone then decomposes catalytically and liberates heat. In the second container of aluminosilicate, nitrogen oxides and water are desorbed and driven off by the now-heated gas. When the aluminosilicate in the first container is charged in this manner with nitrogen oxides and water, the direction of flow is reversed. The process manages without additional heating, avoids poisoning of the catalyst and does not consume any adsorption material. <IMAGE>
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