| 摘要 |
Catalyst comprising a supported Cr(III) amorphous compound, characterized in that the support is formed by an aluminum trifluoride (AlF3) having an high surface area obtainable by alumina fluorination with gaseous HF at an initial temperature lower than 300° C., the temperature is rised with a temperature gradient<=100° C./hour up to the final temperature>320° C. and <450° C., the fluorination is continued at the final temperature until feeding a HF molar amount at least equal to the stoichiometric with respect to the alumina, the fluorination being carried out until a fluorinated alumina with a fluorine content not lower than 95% of the stoichiometric is obtained.
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