METHOD FOR PREPARATION AND ACTIVATION OF MULTIMETALLIC ZEOLITE CATALYSTS, A CATALYST COMPOSITION AND APPLICATION FOR N2-O ABATEMENT

摘要

The present invention relates to the preparation and activation of multimetallic zeolites loaded with transition metals for NSUB2/SUBO abatement in tail-gases from different sources. The NSUB2/SUBO-containing gas is brought in contact with a catalyst comprising Fe and a second, third, or any additional transition metal (Cu, Co, Ni, Mn, Cr, V), with a total metal content ranging from 0.1-1.0 wt. %, on a zeolite support (MFI or BEA) at 523-873 K. Not 10 only the combination and loading of metals, but also the method of incorporation in the zeolite and its activation is essential to obtain active and stable catalysts. The synergy between metals was observed in Fe-Cu, Fe-Co, and Fe-Co-Cu systems, but not with combinations of iron with other transition metals. The optimal catalysts show high NSUB2/SUBO conversions (80%) at temperatures 623 K and stable behaviour for 2000 hours in pilot-scale tests with a zeolite-coated monolithic reactor.