CATALYST AND METHOD OF REDUCING SULPHUR DIOXIDE Russian patent published in 2009 - IPC B01J23/86 B01J21/04 B01J23/10 B01J23/02 B01J23/26 B01D53/50 B01D53/86 C01B17/04 

FIELD: chemistry.

SUBSTANCE: catalyst is described for reducing sulphur dioxide in industrial gas emissions, containing oxides of transition metals and a carrier. The oxides in the catalyst are MgCr₂O₄ spinel or mixture of MgCr₂O₄ and CuCr₂O₄ spinels, in amount of up to 20 wt %, in the following content, wt %: Cr 3-12; Mg 1.5-3.5; Cu 0.1-1.0, in molar ratio Cu/Mg of 0-0.5; the catalyst contains aluminium oxide or aluminium oxide modified with rare earth elements as the carrier in amount of 1-15 wt %, with the carrier constituting the remaining wt %. A method is described for reducing sulphur dioxide to elementary sulphur in industrial gases in the presence of the above described catalyst and a reducing agent. Gas emissions containing 10-65 vol. % sulphur dioxide are reduced. The method is realised at temperature 650-950°C.

EFFECT: high output of sulphur and conversion of sulphur dioxide when cleaning gas emissions in a wide temperature range.

9 cl, 27 ex, 2 tbl