Metal-doped zeolite for use as catalyst material for use in cleaning of exhaust gases, particularly for reduction of nitrogen oxides, has doping metal, which is present in zeolites as monomeric or dimeric species

The metal-doped zeolite has doping metal, which is present in the zeolites as monomeric or dimeric species. The pores size of zeolites are 0.4-1.5 nm, and the doping metal is catalytically active and provided as 1-5 wt.% of metallic oxide. An independent claim is also included for a method for producing metal-exchanged zeolites, which involves manufacturing a zeolite in a closed reaction container with an aqueous suspension, increasing the pH value of the suspension 8-10 by adding ammonia in the form of ammonium hydroxide, and adjusting the oxygen content in the reaction container. Die vorliegende Erfindung betrifft einen metalldotierten Zeolithen, wobei das Dotierungsmetall im Zeolithen als isoliert in Form einzelner Atome und/oder als dimere Spezies vorliegt. Weiter betrifft die vorliegende Erfindung ein Verfahren zur Herstellung eines derartigen Metall-ausgetauschten dotierten Zeolithen. Verwendung finden die erfindungsgemäßen metalldotierten Zeolithe insbesondere bei der Reduktion von Stickoxiden.