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The production of gas oil blending components which a new application of the Pt/SAPO-11 is introduced, while the effect of oxygenic compounds on the isomerization of paraffin mixtures is highlighted. The experiments were carried out on 0.5% Pt/SAPO-11 catalyst at 300-380°C, 30-80 bar, liquid hourly space velocity = 0.75-2.0 h -1 and H 2 /hydrocarbon ratio = 400 Nm 3 /m 3 , while 0.25-5.0% oleic acid was added to the feedstock. At the favourable operational parameters the isoparaffins concentration of the products (cetane number: 78-86, cold filter plugging point: between -19 and -10°C) reached 65-72%, if the oleic acid content of the feedstock was lower than 0.5%. These isomer contents were significantly decreased by increasing the oleic acid content of the feedstock.

The applicability of four catalyst with different composition (conventional and new generation CoMo/ Al 2 O 3 , new composition Pt,Pd/USY, Pt/H-Mordenite) catalysts was investigated for selective desulphurization of different sulphur containing FCC gasolines. The new generation CoMo/Al 2 O 3 and the new composition Pt,Pd/ USY were found to have favourable hydrodesulphurisation activity. The reactions of some C 5 -C 6 olefin and aromatic hydrocarbons are discussed under the conditions of deep desulphurisation, highlighting the effects of that on the octane number.