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Gentler fuel cleanup using zeolites
Nitrogen compounds in transportation fuels can be reduced to very low concentrations using zeolite-based adsorbents under ambient conditions, according to a study. In oil refineries worldwide, nitrogen and sulfur contaminants are removed from feedstocks simultaneously using hydrotreating techniques that are carried out at temperatures above 300 °C and H2 pressures of up to 100 atm in the presence of CoMo and NiMo catalysts. Hydrotreating is more effective for removing organosulfur compounds than organonitrogen species, which tend to be relatively unreactive. But now, AUTHORS have shown that Y-zeolite containing copper cations can remove nitrogen compounds efficiently at room temperature and pressure. Using conventional ion-exchange methods to prepare adsorbents, the team reduced the nitrogen concentration in commercial diesel fuel samples from 83 ppm by weight to well below 0.1 ppm by weight. The researchers point out that the material s adsorption capacity is readily regenerated using solvents or heat treatments.
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