Mechanism of SAPO-34 catalyst deactivation in the course of MTO conversion in slurry reactor

Konnov, S.V.; Pavlov, V.S.; Kots, P.A.; Zaytsev, V.B.; Ivanova, I.I.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Web of Science, Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.

Авторы: Konnov Stanislav V., Pavlov Vladimir S., Kots Pavel A., Zaytsev Vladimir B., Ivanova Irina I.
Журнал: Catalysis Science & Technology
Том: 8
Номер: 6
Год издания: 2018
Первая страница: 1564
Последняя страница: 1577
DOI: 10.1039/c7cy02045g
Аннотация: The deactivation of SAPO-34 catalyst in the course of methanol-to-olefins conversion has been studied in slurry reactor in polydimethylsiloxane media and compared with fixed-bed reactor. The carbonaceous deposits accumulated on the catalyst have been investigated by thermo-gravimetric analysis, UV/vis and fluorescence spectroscopies, MALDI-TOF technique and GC/MS analysis after dissolution of used catalysts in hydrofluoric acid and extraction of coke by dichloromethane. The results show that under slurry conditions the catalyst deactivation is much faster than under fixed-bed conditions. The main reason of fast deactivation is the accumulation of olefin products on the catalyst/polydimethylsiloxane boundary due to their high solubility in polydimethylsiloxane. The mechanism proposed involves interaction of olefins with aromatic compounds formed at the outer surface and in the pore mouths of the catalyst crystals leading to polyaromatic products, which block the entrances to the pores and prevent further reaction. It has been demonstrated that the stability of the catalytic activity with time on stream can be improved by decreasing of N2/CH3OH molar ratio in the flow and by selective poisoning of Brønsted acid sites at the outer surface of the crystals. The results obtained show the way for further improvement of catalytic performance in slurry reactor.
Добавил в систему: Коц Павел Александрович

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Mechanism of SAPO-34 catalyst deactivation in the course of MTO conversion in slurry reactorстатья

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