Oxidative dehydrogenation of propane with N 2O over Fe-ZSM-5 and Fe-SiO 2: Influence of the iron species and acid sites

Ayten Ates, Christopher Hardacre, Alexandre Goguet

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A series of iron containing zeolites with varying Si/Al ratios (11.5-140) and low iron content (∼0.9 wt.% Fe) have been synthesised by solid-state ion exchange with commercially available zeolites and tested, for the first time, in the oxidative dehydrogenation of propane (ODHP) with N 2O. The samples were characterised by XRD, N 2-Adsorption, NH 3-TPD and DR-UV-vis spectroscopy. The acidity of the Fe-ZSM-5 can be controlled by high temperature and steam treatments and Si/Al ratio. The selectivity and yield of propene were found to be the highest over Fe-ZSM-5 with low Al contents and reduced acidity. The initial propene yield over Fe-ZSM-5 was significantly higher than that of Fe-SiO 2 since the presence of weak and/or medium acid sites together with oligonuclear iron species and iron oxides on the ZSM-5 are found to enhance the N 2O activation. The coking of Fe-ZSM-5 catalysts could also be controlled by reduction of the surface acidity of ZSM-5 and by the use of O 2 in addition to N 2O as the oxidant. Fe-ZSM-5 zeolites prepared with solid-state method have been shown to have comparable activity and better stability towards coking compared with Fe-ZSM-5 zeolites prepared by liquid ion exchange and hydrothermal synthesis methods.

    Original languageEnglish
    Pages (from-to)30-41
    Number of pages12
    JournalApplied Catalysis A: General
    Volume441-442
    DOIs
    Publication statusPublished - 28 Oct 2012

    Keywords

    • Dehydrogenation of propane
    • Fe-SiO
    • Fe-ZSM-5
    • Nitrous oxide
    • Propene

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