A method for removing organo-nitrogen compounds from liquid fuel includes contacting the liquid fuel with an adsorbent which preferentially adsorbs the organo-nitrogen compounds. The adsorption takes place at a selected temperature and pressure, thereby producing a non-adsorbed component and an organo-nitrogen compound-rich adsorbed component. The adsorbent includes either a metal or a metal cation that is adapted to form complexation bonds with the organo-nitrogen compounds, and the preferential adsorption occurs by π-complexation.
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