Abstract
Reduced NiMo catalysts supported on titania for transformation of vegetable oils to green diesel have been studied. A series of six catalysts with total metal content equal to 50% and various [Ni/(Ni+Mo)] atomic ratios was prepared following deposition-precipitation method, using urea as precipitating agent. The catalysts were characterized by N2 physisorption, XRD, XPS, H2-TPR, and NH3-TPD. They were evaluated for the transformation of various crude oils, namely sunflower oil, rapeseed oil, soybean oil and cardoon oil, to green diesel, in a high-pressure (40 bar) semi-batch reactor, at 310 °C and under solvent free conditions. A synergistic [Ni/(Ni+Mo)] atomic ratio equal to 0.99 was determined. The catalyst with this formulation exhibited high metallic nickel active surface in combination with high oxygen vacancies population provided by reduced Mo-species. Over this catalyst, the crude vegetable oils were transformed to green diesel achieving yields of 65 ± 2%.
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