EFFECT OF THE VANADIUM COMPONENT ON THE LIFE OF THE WO3-TiO2 CATALYST USED FOR THE REDUCTION OF NOx WITH NH3.

Article abstract of DOI:10.1246/bcsj.55.2254

The 5000-h life test of the WO//3-TiO//2 catalyst for the reduction of NO//x with NH//3 has been investigated in real flue gases containing vanadium and SO//x on a pilot plant. When the present catalyst was used in a residual-oil-fired-boiler flue gas, steady activities over 90% of NO//x reduction were achieved for 5000 h at 400 degree C (space velocity: 2700 h** minus **1). On the other hand, when the catalysts were taken out of the reactors at certain intervals and studied by means of a laboratory reactor, they were much more active than fresh catalyst at lower temperatures (250-350 degree C). Also, the SO//2 oxidation efficiency increased with the reaction time. This activation was considered to be due to the vanadium component in the flue gas.