CATALYST FOR HYDROGENATION AND HYDROLYSIS OF SULFUR COMPOUNDS IN WASTE GASES OF CLAUS PROCESS AND METHOD OF ITS USE Russian patent published in 2024 - IPC B01J23/882 B01J23/883 B01J27/19 B01J21/02 B01J23/887 B01D53/86 B01J35/60 

FIELD: purification of sulphur-comprising gases.

SUBSTANCE: invention relates to catalysts and can be used at oil, gas processing and metallurgical enterprises. A catalyst for the hydrogenation and hydrolysis of sulphur compounds in the exhaust gases of the Claus process is described, including molybdenum, group VIII metals and aluminium oxide, and as group VIII metals the catalyst includes cobalt and/or nickel, and also additionally comprises phosphorus and/or boron compounds and calcium silicate and has the following composition, wt.%: molybdenum (in terms of oxide) 7-15; cobalt and/or nickel (in terms of oxide) 1.5-5; phosphorus and/or boron 0.01-1; calcium silicate 0.1-10; aluminium oxide is the rest. The total pore volume in the catalyst is 0.40-0.75 cm³/g, the porous structure has a bimodal pore size distribution with two maxima, the first maximum in the pore diameter range of 2-50 nm, the second maximum in the pore diameter range of 100-3500 nm, and the volume of pores with a diameter of more than 100 nm is at least 30% of the total specific pore volume, the specific surface is 200-385 m²/g, and the mechanical strength is at least 40 N/granule. The catalyst may be in the form of granules in the form of a cylinder, trefoil, quatrefoil, sphere or ring. Also, a method is described for hydrogenation and hydrolysis of sulphur compounds in the exhaust gases of the Claus process carried out at temperatures of 200-340°C and volumetric flow rates of 900-1500 h^-1, sulphur dioxide content less than 1% vol. and water vapor in the range of 20-40% vol., using the developed catalyst. Preferably, before operation in an industrial reactor, the catalyst is pre-sulphided in a reducing mixture of gases.

EFFECT: development of a catalyst that provides a high (97-100%) degree of hydrogenation and hydrolysis of sulphur compounds in the exhaust gases of the Claus process into hydrogen sulphide at temperatures of 200-340°C and volumetric velocities 900-1500 h^-1.

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