Two-stage crystallisation of the MFI zeolite: kinetic control for efficient catalyst development

Авторы: Pavlov Vladimir S., Bruter Daniil V., Efimov Andrey V., Popov Andrey G., Ivanova Irina I., Zholobenko Vladimir L.
Журнал: Microporous and Mesoporous Materials
Том: 392
Год издания: 2025
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 113649
DOI: 10.1016/j.micromeso.2025.113649
Аннотация: A detailed investigation of the MFI zeolite crystallisation mechanism in an alkaline synthetic gel system has beencarried out using XRD, SEM, nitrogen adsorption, ammonia TPD, elemental analysis, NMR and FTIR spectroscopy. During the first stage of the synthesis, a highly crystalline zeolite is formed via solid hydrogel transformation mechanism, while for a prolonged synthesis, a second stage of crystallisation is clearly distinguished.The zeolite yield and its Si/Al ratio increase during the second stage, whereas the number of defect sites and themesopore volume decrease. The second stage leads to increased diffusion limitations owing to the blockage of thetransport mesopores and to shortened catalyst lifetime in the MTH and butenes oligomerisation processes as wellas to a lower activity in toluene alkylation with methanol. Identification of the second stage of crystallisationpotentially allows for fine tuning of the zeolite catalytic properties by varying the crystallisation time.
Добавил в систему: Жолобенко Владимир Леонидович

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