SELECTIVE CATALYSTS FOR NAPHTHA HYDRODESULPHURISATION Russian patent published in 2011 - IPC C10G45/08 B01J23/882 B01J21/08 B01J35/10 B01J37/02 B01J37/20 B01J38/62 

FIELD: chemistry.

SUBSTANCE: invention relates to a catalyst for hydrodesulphurisation of naphtha, a method of preparing said catalyst and a method for hydrodesulphurisation of naphtha using said catalyst. Described is a method of preparing the catalyst for hydrodesulphurisation of naphtha and versions thereof, involving: (i) saturating a silicon oxide based support, where the support contains at least approximately 85 wt % silicon oxide and has pore volume between 0.6 and 2.0 cm³/g and average pore size between 150 and 2000 Å, (a) with an aqueous solution of a cobalt salt, (b) an aqueous solution of a molybdenum salt and at least one organic additive. The said organic additive contains at least one organic acid and at least one compound selected from a group consisting of compounds containing at least two hydroxyl group and 2-20 carbon atoms, and (poly)ethers of these compounds, to obtain a catalyst precursor; (ii) drying the catalyst precursor at temperature lower than approximately 350°C to obtain a dry catalyst precursor, and (iii) possibly sulphidation of the dry catalyst precursor, provided that the dry catalyst precursor, or catalyst, is not calcined before sulphidation or use for hydrodesulphurisation. The catalyst for hydrodesulphurisation of naphtha prepared using the method given above is described. Described also is a method for hydrodesulphurisation of naphtha, having olefin content of at least 5 wt % in terms of the weight of naphtha, involving sulphidation of the catalyst and its reaction with naphtha under hydrodesulphurisation conditions.

EFFECT: low degree of saturation of olefins while also minimising loss of octane number and achieving high hydrodesulphurisation activity.

33 cl, 1 tbl, 8 ex, 1 dwg