IN-SITU COPPER ION-EXCHANGE ON PRE-EXCHANGED COPPER ZEOLITIC MATERIAL

摘要

A process for preparing a catalyst comprising a zeolitc material comprising copper, the process comprising (i) preparing an acqueous mixture comprising water, a zeolitic material comprising copper, a source of copper other than the zeolitic material comprising copper, and a non-zeolitic oxidic material selected from the group consisting of alumina, silica, titania, zirconia, ceria, a mixed oxide comprising one or more of Al, Si, Ti, Zr, and Ce and a mixture of two or more thereof; (ii) disposing the mixture obtained in (i) on the surface of the internal walls of a substrate comprising an inlet end, an outlet end, a substrate axial length ex-tending from the inlet end to the outlet end and a plurality of passages defined by internal walls of the substrate exteding therethrough; and optionally drying the substrate comprising the mix-ture disposed thereon; (iii) calcining the substrate obtained in (ii).