METHOD FOR PRODUCING METAL-EXCHANGED MICROPOROUS MATERIALS BY SOLID-STATE ION EXCHANGE Russian patent published in 2019 - IPC B01J37/30 B01J29/64 B01J29/85 B01J29/42 B01D53/94 B01D53/56 

FIELD: separation.

SUBSTANCE: invention relates to a method for producing metal-exchanged microporous materials selected from the group consisting of zeolite or zeotype materials having an MFI, BEA or CHA framework structure, or mixtures of said metal-exchanged crystalline microporous materials, and a method for removing nitrogen oxides from exhaust gas by selective catalytic reduction with a reducing agent in the presence of the obtained catalyst. Method for producing a crystalline microporous metal-exchanged material includes steps of providing a dry mixture containing a) one or more crystalline microporous materials that exhibit ion-exchange ability, and b) one or more metal compounds, wherein the metals in the metal compounds are selected from the group of Fe, Co and Cu; heating the mixture in a gaseous atmosphere containing ammonia and one or more nitrogen oxides, oxygen in an amount of 1 vol. % or less and water in an amount of 5 vol. % or less, to a temperature and for a time sufficient for the initiation and implementation of solid-phase ion exchange of the metal compound ions and the ions of the crystalline microporous material; and obtain a metal-exchanged crystalline microporous material. Production of metal-exchanged crystalline microporous materials is significantly improved when solid-state ion exchange is carried out with a physical mixture of oxide and / or metal salt and crystalline microporous material in an atmosphere containing NO and NH₃.

EFFECT: advantage of the present invention is that metal-exchanged microporous material can be obtained at temperatures below 300 °C.

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