| 摘要 |
<p>PROBLEM TO BE SOLVED: To effectively regenerate a chromium oxide catalyst with deteriorated activity by impregnating the catalyst with a solution containing copper, alkali metal, rare earth metal, and transition metal excluding copper and burning it when the catalyst of chromium oxide as a main component which is used for the production of chlorine by the oxidation of hydrogen chloride. SOLUTION: In the regeneration of a catalyst of chromium oxide as a main component which is used for the production of chlorine by the oxidation of hydrogen chloride, the catalyst is impregnated with a solution containing copper, alkali metal, rare earth metal, and transition metal excluding copper and burned at 800 deg.C or below. In this process, potassium is preferable as alkali metal, lanthanum as rare earth metal, and cobalt as transition metal excluding copper. The catalyst containing chromium oxide as a main component, which is a basic catalyst, is prepared by burning a mixture of chromium salt such as chromium nitrate, ammonia or a compound which releases ammonia such as urea, and a silicon compound at 800 deg.C or below.</p> |
