Reduction of NO with NH3 on Calcined Pyrite
1976 Volume 55 Issue 4 Pages 235-243
Details
1976 Volume 55 Issue 4 Pages 235-243
Natural are of pyrite (FeS2), hematite (α-Fe2O3) and pyrite sinder (α-Fe2O3) obtained from a manufactory of sulfuric acid showed low activity in the reduction of NO with NH3, On the other hand, calcined pyrite was found to be very active in the reaction. Pyrite calcined at 450°C showed the most highest activity. The degree of NO conversion was 100% under the conditions of NO 300ppm, NH3 300ppm, O2 15%, SO2 500ppm, H2O 10%, CO 1%, N2 balance, SV 8000 hr-1 and reaction temperature 400°C.
The calcined pyrite mainly consisting of hematite (α-Fe2O3) were porous and had larger BET surface area compared with natural are of pyrite.
The activity of the calcined pyrite for the reaction became higher when it was treated with a solution of sulfuric acid. The reason seem to be attributed to the fact that ferrous sulfate were formed on the surface of the calcined pyrite by the acid treatment. On the other hand, the activity of the calcined pyrite was suppressed by the treatment with a solution of nitric acid or hydrochloric acid.
