| http://www.w3.org/ns/prov#value | - A catalytic composition in accordance with claim 1, obtained by coprecipitation, in which the alumina content is between 5 and 20% of the total weight of the catalyst, the remaining 80 to 95% being made up of iron and chromium active elements in oxide form and at least one promoter selected from rare earth oxides such as cerium, lanthanum and neodymium oxides.
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