Boreskov Institute of Catalysis of the Siberian Branch of Russian ...

PP-V-13INVESTIGATION OF HYDRODEAROMATIZATION OF GAS OILSON NOBLE METAL/SUPPORT CATALYSTSNagy G.*, Hancsók J.*, Pölczmann Gy.*, Varga Z.**, Kalló D.****University of Pannonia, Institute of Chemical and Process Engineering, Department ofHydrocarbon and Coal Processing, Veszprém, Hungary, H-8201 Veszprém, P.O Box: 158,Hungary, Phone: +36 88/624413, Fax: +36 88/624520,E-mail: nagyg@almos.uni-pannon.hu** MOL Hungarian Oil and Gas Co., Százhalombatta, Hungary, P.O. Box 1, H-2443,E-mail: zovarga@mol.hu*** Chemical Research Centre, Institute of Chemistry, Hungarian Academy of Sciences,Budapest, Hungary, P.O. Box 17, H-1525, Hungary, Phone: +36 1/4381100,E-mail: kallo@chemres.huDiesel fuel specifications are continuously tightening and its demand is also growing,especially in the European Union. Sulphur limit of diesel fuels is currently 50 mgS/kg in theEuropean Union that will be reduced to 10 mgS/kg from 2009. However, ultra low sulphur(lower than 10 ppm) diesel fuels shall already be made available regionally in ageographically balanced manner [1]. Not only sulphur limits but also aromatics content isexpected to become stricter. The limit of polycyclic aromatic content of diesel fuel iscurrently 11% in the standard, but a maximum specification for total aromatics content islikely to be established beside the limit for polycyclic aromatics. Reduction of the aromaticcontent of diesel fuels is relevant, because aromatic hydrocarbons have low cetane numberand cetane index, contributing to the increase of vehicle HC and PM emissions. Technologiesapplied in the refining industry can be divided into the following categories [1].One-step processes are used for converting feeds having high sulphur, nitrogen andaromatic content on transition metal (NiMo/alumina or CoMo/alumina) catalysts (deepheteroatom removal and partially aromatic-hydrogenation).Two-step processes are used for converting feeds having high sulphur, nitrogen andaromatic content: in the first stage deep heteroatom removal and partially aromatichydrogenationon transition metal catalysts (NiMo/alumina or CoMo/alumina) occurred andin the second stage further deep heteroatom removal and deep aromatic reduction ofpreviously hydrodesulphurized feeds on monometallic (Pt/alumina) or bimetallic (Pt,Pd/USY,Pt,Pd/HY zeolite) noble metal catalysts occurred.For these reasons, in recent years, sulphur and nitrogen tolerant (up to 50-200) preciousmetal catalysts have attracted much attention for the hydrogenation of aromatics in dieselfuels in the second stage of the two-step processes [2]. In case of monometallic noble metal481