METHOD OF PRODUCING MICRO-MESOPOROUS ZEOLITE OF MORDENITE STRUCTURAL TYPE Russian patent published in 2024 - IPC C01B39/26 

FIELD: various technological processes.

SUBSTANCE: invention relates to methods of producing micro-mesoporous zeolite of mordenite structural type. Disclosed is a method consisting in the fact that halloysite nanotubes are dispersed in an aqueous solution of sodium hydroxide, pyrogenic silicon dioxide and 1–5 wt.% mordenite starter seeds are added to the obtained mixture with vigorous stirring to obtain a gel of composition (2–6)Na₂O:Al₂O₃:(10–30)SiO₂:(520–780)H₂O. Said gel is subjected to hydrothermal treatment in steel autoclave with Teflon insert without stirring at 145.0–190.0 °C for 24–48 hours. Obtained precipitate is filtered, washed with distilled water and dried initially in air at room temperature for 18–24 hours, then in muffle box at 95.0–110.0 °C for 12–16 hours. Aqueous ammonium nitrate solution is added to the obtained sodium form of the zeolite of mordenite structural type and mixed. Formed buffer mixture is filtered, washed with distilled water to a filtrate pH value of 7. Obtained precipitate is washed, dried and calcined at temperature of 550.0–600.0 °C in air flow to obtain the target product.

EFFECT: recrystallisation of halloysite nanotubes into a micro-mesoporous zeolite of the MOR type in such a way that silicon and aluminium atoms form a microporous zeolite framework, and halloysite nanotubes provide formation of secondary mesopores, wherein reagent pretreatment steps are excluded; disclosed method enables to obtain a micro-mesoporous mordenite-type zeolite in fewer steps and in less time than in existing methods.

1 cl, 2 dwg, 1 tbl, 7 ex