Process and catalyst comprising at least one EU-1 and/or NU-86 and/or NU-87 zeolite for reducing oxides of nitrogen in an oxidizing medium

Abstract

The present invention provides a process for reducing oxides of nitrogen to molecular nitrogen in a medium which is superstoichiometric in oxidizing agent using reducing agents in the presence of a catalyst comprising: at least one refractory inorganic oxide at least in part constituted by a zeolite from the group formed by NU-86, NU-87 and EU-1; optionally, at least one element (A) from groups VIB, VIIB, VIII and IB, the transition metals; optionally, at least one element (B) from group VIII, the noble metals comprising platinum, rhodium, ruthenium, iridium and palladium; and optionally at least one element (C) from group IIA, the alkaline-earths and/or group IIIB, the rare earths. The invention also provides a catalyst comprising at least one refractory inorganic oxide at least in part constituted by at least one zeolite from the group formed by NU-86, NU-87 and EU-1 and at least one element selected from the group formed by elements from groups VIB, VIIB, VIII and IB, the transition metals, and from noble group VIII metals. The invention also concerns the preparation of the catalyst.

Dependencies are inferred from the claim text.