| http://www.w3.org/ns/prov#value | - The highly activated alumina used in the invention is one obtained by depositing on alumina at least one catalyst component selected from noble metals such as platinum, palladium and silver, and oxides of heavy metals such as iron, manganese, chromium, copper, nickel and cobalt, for example Fe2 O3, CuO, MnO2, Mn2 O3, Cr2 O3, NiO, CoO and Co3 O4 which are generally used as oxidation catalysts for c
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