The Boc Group, Inc.

Sued-chemie IP Gmbh & Co. Kg

Tricat Management Gmbh

Süd-chemie IP Gmbh & Co Kg

Helge Toufar

Frank R Fitch

Adeola Florence Ojo

Martin Bulow

Arno Tissler

Roderik Althoff

Simone Toufar

Philip Kenerick Maher

A metal-doped or metal-exchanged zeolite is disclosed, wherein the doping metal is present in the zeolite in the form of individual atoms i.e. as monomeric and/or dimeric species. Further, a process for the preparation of such a metal-doped or metal-exchanged zeolite is disclosed. The metal-doped zeolites are useful, in particular, as catalysts for the reduction of nitrogen oxides.

Metal doped zeolite and process for its preparation

Zeolites exchanged with lithium ions and, optionally, with polyvalent cations are prepared by ion-exchanging a sodium-containing zeolite, a potassium-containing zeolite or a sodium- and potassium-containing zeolite with ammonium ions, thereby replacing the sodium and/or potassium ions with ammonium ions, and then reacting the ammonium ion-exchanged zeolite with a water-soluble lithium compound under conditions which result in the removal of ammonia from the reaction zone. Polyvalent ions, which may be present in the zeolite undergoing ion-exchange, will not be substantially replaced by the ammonium or lithium ions.

Method of manufacture of molecular sieves

Growing community of inventors

Dessau, Germany

Helge Toufar