| 摘要 |
<p>PURPOSE:To repeatedly activate a catalyst lowered in its activity, in the activation and regeneration of a fluorinating catalyst of halogenated hydrocarbon based on chromium, by successively applying oxidizing treatment and reducing treatment whose temp. ranges are respectively specified to the used catalyst. CONSTITUTION:When a fluorinating catalyst of halogenated hydrocarbon based on chromium used as an aerosol, a refrigerant, a foaming agent or a solvent lowered in its activity is activated, at first, oxidizing treatment bringing said catalyst into contact with oxidative-gas (O2, N2O or O3) at 150-500 deg.C is performed and, subsequently, reducing treatment bringing the catalyst into contact with reductive gas (H2, CO or NO) at 100-500 deg.C is performed. In succession to these treatments, reaction may be resumed immediately but it is pref. to resume reaction after the catalyst is again treated with HF. By these treatments, the activity of the catalyst can be restored up to the initial activity level without scattering effective components.</p> |
