METHOD FOR PRODUCING METAL EXCHANGED ZEOLITES BY SOLID-STATE ION EXCHANGE AT LOW TEMPERATURES Russian patent published in 2018 - IPC B01J37/30 B01J29/64 B01J29/42 B01D53/56 B01D53/94 

FIELD: chemical or physical processes.

SUBSTANCE: present invention relates to a method for producing metal-exchanged zeolite materials by exposing a physical mixture of a metal oxide and a zeolite material having an ion-exchange capacity, to an atmosphere containing ammonia, at 150–250 °C, as well as to methods for catalytic reduction of NO_x, for example, in the exhaust of power plants or in the exhaust of diesel engines, in the presence of the obtained zeolite material. Method of obtaining a metal-exchanged zeolite material or mixtures of metal-exchanged zeolite materials includes the following steps: providing a dry mixture containing a) one or more zeolite starting materials, which have a frame structure with the designation MFI and which exhibit ion-exchange capacity, and b) one or more metal compounds; heating the mixture in a gaseous atmosphere containing ammonia, at temperatures between 150 °C and 250 °C and for a time sufficient to initiate and carry out ion exchange in the solid state of the metal compound ions and ions of one or more zeolites; preparing a metal-exchange zeolite material or a mixture of metal-exchanged zeolite materials, wherein the metal compound is Cu (I) oxide.

EFFECT: advantage of the present invention is that zeolite materials that are active during catalytic reduction of NO_x, can be obtained at significantly lower temperatures, thus reducing the risk of damage to these materials during the introduction of metal ions.

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