CATALYST FOR REDUCTION OF NITROGEN OXIDES IN INDUSTRIAL WASTE GASSES Russian patent published in 1996 - IPC

FIELD: nitrogen oxides neutralization in waste gasses exhaust of industrial facilities - heat and power plants, compression stations, gas processing works etc. SUBSTANCE: catalyst has active phase based on platinum group metal and carrier. As active phase in the case it has 11-tungsten silicates of potassium of general formula K_x[SiW₁₁MO₃₉]_yH₂O, with M = Pd,Rn or Pt. x = 8, y = 4; x = 4, y = 6; x = 5, y = 8; or molybdenum silicates of potassium of general formula K_x[SiMo₁₁MO₃₉]_yH₂O, with M=Pd, Rn or Ft.x = 6, y = 14; x = 4, y = 9; x = 5, y = 12 with following shares of components (mass %): 11-tungsten silicates of potassium or 11-molybdenum silicates of potassium in terms of active metal - 0.05 - 0.35; carrier - balance (up to 100%). In preferable versions as active phase catalyst may have mixture of 11-tungsten silicates of potassium taken in equimolar ratios or mixture of 11-molybdenum silicates of potassium taken in equimolar ratios. Catalyst provides 70 - 80 5 purification of exhausted waste gasses from nitrogen oxides under working temperatures of 400 - 450 C and industrial speeds of gas streams. Catalyst demonstrates high selectivity in process of transformation of nitrogen oxides in exhaust molecular nitrogen - 85 - 90 %. EFFECT: catalyst allows to increase degree of nitrogen oxides neutralization in industrial waste exhausted gasses. 3 cl, 1 tbl