CATALYST FOR SELECTIVE HYDROGENATION OF ACETYLENE AND DIENE HYDROCARBONS IN C-C-HYDROCARBON FRACTIONS Russian patent published in 2015 - IPC B01J23/44 B01J21/04 B01J32/00 B01J35/04 C07C5/05 C07C5/09 

FIELD: chemistry.

SUBSTANCE: composition of the catalyst is formed in the following ratio, wt %: palladium 0.005-1, promoter 0.005-5, copromoter if necessary 0.005-5, carrier - the remaining part. The promoter on the carrier is fixed in the oxide form to the active component. Palladium particles are fixed on the carrier in the zero degree of oxidation in the electronic condition of valence orbitals of their own atoms. The catalyst is characterised by a band of an absorbing complex of carbon monoxide with palladium with the wave number of 2060-2100 cm^-1 in the infrared spectrum of absorbed carbon monoxide. As the carrier applied is a highly-porous cellular carrier, produced from a metal or aluminium oxide, characterised by the porosity not less than 85%, the average size of the pores is 0.5-6.0 mm. On the highly-porous cellular carrier placed is a layer of aluminium oxide with the formation of a secondary carrier, on which the promoter and the active component palladium are successively placed. The secondary carrier aluminium oxide is characterised by the width from 10 mcm to 500 mcm, specific surface of not less than 20 m²/g, volume of the pores from 0.1 to 1.0 cm³/g and is made with the pores with a diameter over 5 nm, the volume of which constitutes 50-98% of the total volume of the pores. The secondary carrier in the general composition of the catalyst constitutes not less than 5 wt %.

EFFECT: improvement of thermo- and weight-exchange and diffusion characteristics with the elimination of a possibility to form local overheats of the catalyst layer and diffusion limits of the transport of initial compounds and reaction products.

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