Synthesis and Properties of Pt/B2O3в€’Al2O3 Catalysts of Vegetable Oil Hydrocracking
YU. A. CHUMACHENKO, A. V. LAVRENOV, T. I. GULYAEVA, A. B. ARBUZOV, E. A. BULUCHEVSKIY, V. A. DROZDOV
Institute of Hydrocarbons Processing, Siberian Branch of the Russian Academy of Sciences, Ul. Neftezаvodskаya 54, Omsk 644040 (Russia)
Keywords: одностадийный гидрокрекинг, растительное масло, нанесенные платиновые катализаторы, боратсодержащий оксид алюминия, возобновляемое дизельное топливо, one-stage hydrocracking, vegetable oil, supported catalysts, borate-containing aluminium oxide, renewable plant diesel fuel
Abstract
Effect of the concentration of hydrogenising component of Pt/B2O3−Al2O3 catalysts on the yield and composition of diesel fractions formed during one-stage hydrocracking of sunflower-seed oil at a temperature of 400 and 350 °C, pressure 4.0 MPa, mass rates of raw material input 5.0 and 1.0 h-1 was studied. It was established by means of TPR-Н2, IR spectroscopy of adsorbed СО and ESDR that the hydrogenating component of the catalysts is represented by the particles of metal platinum Pt 0. Catalytic systems with metal content 0.3−1.0 mass % provide complete hydrodeoxygenation of oil and the maximal yield of the diesel fraction as a result of decarboxylation, hydrodecarbonylation and "reduction" proceeding on them. The major components of diesel fractions obtained with these systems at a temperature of 350 °C and mass rate of raw material input 1.0 h-1 are n -alkanes С15−С18. Diesel fractions formed in the presence of the indicated systems at a temperature of 400 °C and mass rate of raw material input 5.0 h-1 in addition to n- alkanes also include isoalkanes and cycloalkanes (up to 40 mass %). As a result of hydrocracking of oil on the catalyst with Pt content of 0.5 mass % for 20 h at a temperature of 400 °C and mass rate of raw material input 1.0 h-1, diesel fraction with the yield not less than 82.0 mass % and mass fraction of isoalkanes not less than 76.1 % was obtained.
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