METHOD FOR PRODUCING POWDER-LIKE POROUS CRYSTALLINE METAL SILICATES USING FLAME SPRAY PYROLYSIS Russian patent published in 2023 - IPC C01B37/00 C01B39/02 C01B33/20 

FIELD: production of synthetic zeolites.

SUBSTANCE: method for producing powdered porous crystalline metal silicate includes hydrothermal synthesis using an aqueous mixture containing a silicon source, a metal source, and an auxiliary component to obtain an aqueous suspension of a reaction product containing a crude porous crystalline metal silicate. The silicon source is selected from the group consisting of fumed silica, precipitated silica, sol-gel silica, and mixtures thereof. The metal source is a titanium, iron or aluminium source. The aqueous suspension contains solids in an amount≤ 70 w/w.%. Then flame spray pyrolysis of the reaction product is carried out, where the resulting aqueous suspension is sprayed into a flame formed during the combustion of fuel in the presence of oxygen to obtain a porous crystalline metal silicate powder. Hydrogen is used as fuel. The maximum effective temperature T_eff, to which at least 90 w/w % of the porous crystalline metal silicate is heated during flame pyrolysis, is in the range of T_min. <T_eff <T_max, where T_min is 750°C, T_max is 1250°C.

EFFECT: invention makes it possible to reduce the time and energy required to obtain a porous metal silicate powder, while maintaining an ordered porous metal silicate crystal structure and its catalytic characteristics.

16 cl, 7 dwg, 1 tbl, 10 ex