| http://www.w3.org/ns/prov#value | - As respects the second catalyst component, a powder is obtained by immersing a porous carrier such as zeolite in the aqueous solution of a salt of platinum, for example, drying the wet carrier at a temperature of 80??? C. to 250??? C., preferably of 100??? C. to 150??? C., and calcining the dried carrier at a temperature of 300??? C. to 850??? C., preferably of 400??? C. to 700??? C., for a period
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