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AssigneeMitsui Toatsu Chemicals, Inc.
InventorsKatsuharu Miyata, Jyoji Morisaki, Teruo Hirayama, Hironori Kamachi, Kunihiro Yamada
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A method for preparing an improved catalyst for use in the preparation of chlorine by the oxidization of hydrogen chloride with an oxygen-containing gas. The catalyst mainly comprises chromium oxide and can be used for a long period of time particularly under low oxygen content conditions, and the activity of the catalyst does not easily deteriorate, and in other words, the catalyst has a long life. Furthermore, there are disclosed the catalyst obtained by this preparation method, and a method for preparing chlorine from hydrogen chloride by the use of the catalyst. The method for preparing the improved catalyst comprises adding copper, an alkali metal and a rare earth metal, or adding chromium, copper, an alkali metal and a rare earth metal to a catalyst containing chromium oxide as a main component, and then calcining the catalyst at a temperature of 800.degree. C. or less.
A catalyst for the preparation of chlorine by oxidizing hydrogen chloride with an oxygen-containing gas which is obtained by adding copper, an alkali metal and a rare earth metal, or adding chromium, copper, an alkali metal and a rare earth metal to a catalyst containing chromium oxide as a main component that is obtained by calcining, at a temperature of 800.degree. C. or less, a mixture comprising a silicon compound and a reaction product of a chromium salt and ammonia or a compound capable of releasing ammonia.
A method for preparing a catalyst for the preparation of chlorine from hydrogen chloride by oxidizing hydrogen chloride with an oxygen-containing gas which comprises a step of impregnating a catalyst containing chromium oxide as a main component that is obtained by calcining, at a temperature of 800.degree. C. or less, a mixture comprising a silicon compound and a reaction product of a chromium salt and ammonia or a compound capable of releasing ammonia, said step of impregnating being with a solution containing copper, an alkali metal and a rare earth metal, or a solution containing chromium, copper, an alkali metal and a rare earth metal, and a step of calcining the impregnated catalyst at a temperature of 800.degree. C. or less.
A method for preparing chlorine comprising the step of oxidizing hydrogen chloride with an oxygen-containing gas in the presence of a catalyst obtained by adding copper, an alkali metal and a rare earth metal, or adding chromium, copper, an alkali metal and a rare earth metal to a catalyst containing chromium oxide as a main component that is obtained by calcining, at a temperature of 800.degree. C. or less, a mixture comprising a silicon compound and a reaction product of a chromium salt and ammonia or a compound capable of releasing ammonia.
Dependencies are inferred from the claim text.