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 {HEAD ~ process} comprising contacting said {TAIL ~ 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, the iron oxide being made up of a reduced natural limonitic goethite 
comprising contacting
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 { HEAD ~ process } comprising contacting said { TAIL ~ 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 , the iron oxide being made up of a reduced natural limonitic goethite
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