Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia

PP-13HYDROCONVERSION OF VEGETABLE OILS INTO HYDROCARBON-BASED BIODIESEL OVER NONSULFIDED CATALYSTS:A COMPARATIVE STUDY OF METAL CATALYSTSSUPPORTED ON BORATED ALUMINAChumachenko Yu., Lavrenov A., Skorpluk A., Drozdov V.,Gulyaeva T., Arbuzov A., Buyalskay K., Kudrya E.Institute of Hydrocarbons Processing of SB RAS, Russia, Omsk,Neftezavodskay, 54, Fax +7-3812-64-61-56, E-mail: lavr@ihcp.oscsbras.ruHydrocarbon diesel fuels produced from vegetable oils do not yield to the bestsamples of oil origin fuels in combustion value and low-temperature properties. Theygreatly surpass them in cetane characteristics and environmental safety at theexpense of practically full absence of sulfur compounds and aromatic components.The employment of sulfided catalysts by hydroconversion of neat vegetable oilsrequires the addition of sulfur-containing compounds in the process for keeping of thecatalyst activity and lifetime. In the framework of this paper for development ofcatalyst of vegetable oils processing into hydrocarbon diesel fuels it is first suggestedto examine bifunctional catalytic compositions based on Pt, Ni, Co, Mo, W-containingsystems with B 2 O 3 -Al 2 O 3 as a solid-acid support. The catalysts were characterized byBET method, XRD, FTIR, UV, TPR H 2 , TPD NH 3 , CO chemisorption. The catalystscreening is carried out in fixed-bed reactor in H 2 atmosphere under constanttemperature (400°C), pressure (4 MPa) and WHSV of sunflower oil (5 h –1 ). It isshown, that on all catalysts, including initial support, decomposition of vegetable oilproceeds with yield of liquid products about 70-85 wt%. Hydroconversion oftriglycerides, containing in vegetable oil most efficiently proceeds on Pt and Nicontaining catalysts. For both catalysts heavy cycloalkanes and arenes, and alsoalkanes with number of carbon atoms in molecule up to 35 are found in liquidhydrocarbon products. They are products of side reactions of cyclization,aromatization and condensation. Thus, established level of jet and diesel fuel in liquidproducts does not exceed 63 wt%. Selective conversion of vegetable oils intoalkanes is achieved at 350°C and 4 MPa over a 0.5 wt% Pt catalyst. The resultsshow that platinum catalyst gives a 78% yield of liquid products. It is determined thatliquid products contain mostly alkanes C 17 and C 18 (up to 53 and 35.3 wt.%respectively). Furthermore, the gas-phase analysis demonstrates that thedecarboxylation and decarbonylation reaction are more profound over this catalyst.102