METHOD FOR PRODUCING METAL EXCHANGED METALLO-ALUMINOPHOSPHATES BY SOLID-STATE ION EXCHANGE AT LOW TEMPERATURES Russian patent published in 2018 - IPC B01J37/30 B01J29/85 B01J29/84 B01D53/56 B01D53/94 

FIELD: chemical or physical processes.

SUBSTANCE: invention relates to a method for producing metal exchanged crystalline microporous silicoaluminophosphate materials with a CHA framework structure and to method for removing nitrogen oxides from exhaust gas by selective catalytic reduction with a reducing agent in the presence of said catalyst. Method for producing a metal exchanged crystalline microporous silicoaluminophosphate or mixtures containing metal exchanged microporous silicoaluminophosphate materials with a CHA framework structure includes steps of: providing a dry mixture comprising a) one or more CHA silicoaluminophosphate starting materials that exhibit an ion-exchange capacity, and b) one or more metal compounds selected from the group Fe, Co, Cu; heating the mixture in a gaseous atmosphere containing ammonia to a temperature of 100 °C to 250 °C and for a time sufficient to initiate and perform ion exchange in the solid state of the ions of the metal compound and the ions of the crystalline microporous material; and obtaining a metal exchanged microporous silicophosphate material or mixtures containing metal exchanged microporous silicoaluminophosphate material.

EFFECT: technical result - crystalline microporous silicoaluminophosphate materials can be obtained at much lower temperatures, thus reducing the risk of damage to these materials during the introduction of metal ions.

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