| http://www.w3.org/ns/prov#value | - The hydrous alumina used in the present invention has, in general, a particle size smaller than 5 ??m, especially smaller than 3 ??m, a BET specific surface area of 200 to 400 m2 /g and a pore volume of 0.2 to 0.6 ml/g, especially 0.3 to 0.5 ml/g.
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