| 摘要 |
PURPOSE:To prevent ozone decomposition power from lowering even if nitrogen oxides coexist with ozone by removing NOx using an adsorbent or a NOx decomposition catalyst before ozone decomposition in the case of decomposition of ozone in a waste gas containing ozone as well as nitrogen oxides. CONSTITUTION:In a method for decomposing ozone in a waste gas containing ozone as well as nitrogen oxides, a NOx removal filter is put in a prior stage to an ozone decomposition catalyst. The filter may be an adsorbent which adsorbs NOx at the temperature of usage condition or a substance which decomposes NOx into N2 and O2 or into NO less reactive with metal oxides than NO2. Alkaline earth metal oxides, alkaline earth hydroxides, alkali metal- zeolite such as Na-X, perovskite compounds such as Y1, Ba2, Cu3, etc., are used as the NOx adsorbent. Ni, Fe, Cu-ZSM-5, etc., are used as the NOx decomposition catalyst. By this method, without the ozone decomposition power being lowered, ozone is decomposed even if nitrogen oxides coexist with ozone. |
