A process is described for the extractive oxidation of contaminants present in raw fuel streams rich in heteroatomic polar compounds and catalyzed by iron oxides contained in natural limonitic goethite, said {TAIL ~ process} comprising contacting said streams with an oxidation pair which is a peroxide in solution/organic acid in amount of at least 3 and an amount between 0.01 and 10 wt % of an iron oxide, both based on the feed, {HEAD ~ the iron oxide} being made up of a reduced natural limonitic goethite 
A process is described for the extractive oxidation of contaminants present in raw fuel streams rich in heteroatomic polar compounds and catalyzed by iron oxides contained in natural limonitic goethite , said { TAIL ~ process } comprising contacting said streams with an oxidation pair which is a peroxide in solution / organic acid in amount of at least 3 and an amount between 0.01 and 10 wt % of an iron oxide , both based on the feed , { HEAD ~ the iron oxide } being made up of a reduced natural limonitic goethite
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