CATALYST FOR SELECTIVE CATALYTIC REDUCTION (SCR), CONTAINING COMPOSITE OXIDE CONTAINING V AND SB, METHOD OF ITS PRODUCTION AND ITS APPLICATION FOR REMOVAL OF NITROGEN OXIDES Russian patent published in 2020 - IPC B01D53/94 B01J21/06 B01J23/22 B01J23/16 B01J35/04 B01J37/04 B01J37/03 B01J37/08 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a catalyst composition comprising a substrate containing TiO₂ , a composite oxide containing vanadium and antimony, having a rutile type structure different from VSbO₄ and V_0.92Sb_0.92O₄, determined by X-ray diffraction analysis (XRD) with the help of Cu Kα radiation, and one or more oxide selected from a group consisting of silicon oxides, vanadium oxides and antimony oxides, where the method includes the following stages: (i) mixing vanadium oxide/antimony and optionally a silicon source with a substrate containing TiO₂ in a solvent to obtain a suspension; (ii) applying the suspension onto the substrate; (iii) drying at temperature in range of 80 to 250 °C; (iv) calcining at a temperature in range of 550 to 700 °C, wherein the vanadium/antimony oxide used in step (i) is obtained by (a) providing a suspension, containing oxide (oxides) of vanadium and antimony oxide (s); and (b) drying the suspension to obtain vanadium/antimony oxide at temperature in range of 80 to 250 °C or where vanadium/antimony oxide used at step (i), is obtained by (a') providing a suspension or solution containing a vanadium source and a stibium source; (b') deposition and separation of vanadium/antimony oxide from suspension or solution and (c') if necessary drying at temperature in range of 80 to 250 °C, where vanadium, including vanadium as in composite oxide of vanadium and antimony, and optional vanadium oxide(s) is present in the catalyst composition in range of 0.5 to 6 wt %, preferably from 1 to 4.5 wt % and more preferably from 2 to 4 wt %, calculated as elementary V; and wherein antimony, including antimony in both vanadium and antimony composite oxide, and optionally antimony oxide(s), is present in the catalyst composition in range of 0.8 to 16 wt %, preferably from 3.5 to 14 wt % and more preferably from 5 to 10 wt %, calculated as elementary Sb, and where composite oxide containing vanadium and antimony, differs by diffraction peak XRD of plane (110) at 2θ in range from 27.25 to 29.00° and diffraction peak XRD of plane (101) at 2θ in range from 35.43 to 37.00°. Invention also relates to a catalyst composition and use thereof for selective catalytic reduction of nitrogen oxides.

EFFECT: invention allows more efficient removal of nitrogen oxides.

9 cl, 3 tbl, 8 ex, 4 dwg