PROCESS FOR THE PREPARATION OF A CATALYST COMPOSITION COMPRISING TIO2, WO3, AND A RARE EARTH METAL VANADATE

摘要

"Process for the preparation of a catalyst composition comprising TiO2, WO3, and a rare earth metal vanadate" wherein RE is at least one of the group of rare earth metals Y, Ce, Pr, Nd, Sm, Er, and Yb in an amount of up to 6.0 wt.-%; V is vanadium in an amount of 0.2-2.5 wt.-% O is oxygen in an amount of up to 3,5 wt.-%; and S is a support containing TiO2 in an amount of at least 70 wt.-%, with the rest being WO3 and optionally SiO2. This catalyst composition shows high removal efficiencies for NOx even after aging at 750° C.