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 process comprising contacting said streams with an oxidation pair which is a peroxide in {HEAD ~ solution/organic acid} in {TAIL ~ 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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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 process comprising contacting said streams with an oxidation pair which is a peroxide in { HEAD ~ solution / organic acid } in { TAIL ~ 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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