Unusual Effect of Support Carbonization on the Structure and Performance of Fe/Mgal2o4 Fischer–Tropsch Catalyst

Chernavskii, P.; Kazantsev, R.; Pankina, G.; Pankratov, D.; Maksimov, S.; Eliseev, O.L.

Авторы: Chernavskii Petr, Kazantsev Ruslan, Pankina Galina, Pankratov Denis, Maksimov Sergey, Eliseev Oleg L.
Журнал: ENERGY TECHNOLOGY
Том: 9
Номер: 2
Год издания: 2021
Первая страница: 1
Последняя страница: 9
Номер статьи: 2000877
DOI: 10.1002/ente.202000877
Аннотация: DOI: 10.1002/ente.202000877Carbonization of MgAl2O4 spinel via glucose treatment was applied for preparation spinel‐supported iron Fischer–Tropsch synthesis (FTS) catalysts. The catalysts were characterized by Low‐temperature adsorption of N2, TEM, Mössbauer spectroscopy, in situ magnitometry and were tested in high temperature FTS conditions. Surface carbonization leads to magnetite formation in the course of catalyst calcining, likely owing to reductive function of surface carbon. On the contrary, hematite is formed if iron precursor is deposited on pristine spinel. Support carbonization facilitates iron precursor reduction into carbide during catalyst activation step in synthesis gas flow and gives rise to highly dispersed iron nanopartilcles. Comparison of sequential and co‐impregnation approaches for support carbonization revealed that the first one is preferable in terms of Hägg carbide formation during catalyst activation. Specific activity of the catalysts in high temperature FTS is approximately doubled due to the support carbonization. The carbonization also boosts C5+ selectivity and olefin percentage in the product hydrocarbons while methane formation is suppressed. Adding potassium to catalyst formulation suppresses iron carbide oxidation and Fe3O4 formation, as well as promotes conversion of χ‐Fe5C2 into θ‐Fe7C3 in FTS conditions.
Добавил в систему: Панкина Галина Викторовна

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Unusual Effect of Support Carbonization on the Structure and Performance of Fe/Mgal2o4 Fischer–Tropsch Catalystстатья

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