Experimental study of interactions between uranium and n- alkanes in hydrothermal conditions (500 bar, 200°C)
Résumé
Organic matter is commonly involved in uranium deposits by reducing and alteration processes. An experimental study of the pyrolysis of linear n-alkanes at 200°C, 500 bar for 2 months in presence of water and/or uranium were carried out. These experiments reveal that the initiation mechanism of the reaction pathway is the reduction of uranium and the oxidation of organic matter and that the oxidation of n-alkanes produces different compounds (aldehydes, alcohols, ketones, carboxylic acids, esters) in different configurations and proportions by auto-oxidation and free-radical reactions. Another parameter observed during the experiments is the increase of the oxidation process the longer the aliphatic chain is. The pyrolysis of n-octane particularly revealed the role of water as an oxidizing agent instead of auto-oxidation mechanisms.
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