Fischer–Tropsch synthesis over Zr-promoted Co/γ-Al2O3 catalysts

Javier Barrientos, Victoria Garcilaso, Baldassarre Venezia, Atte Aho, José Antonio Odriozola, Magali Boutonnet, Sven Järås

    Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

    7 Citeringar (Scopus)

    Sammanfattning

    Two Zr-modified alumina supports were synthetized containing the same amount of Zr but a different distribution of this modifier over the alumina surface. These supports, together with the unmodified alumina carrier, were used to prepare three cobalt-based catalysts which were characterized and tested under relevant Fischer–Tropsch conditions. The three catalysts presented very similar porosity and cobalt dispersion. The addition of Zr nor its distribution enhanced the catalyst reducibility. The catalyst activity was superior when using a carrier consisting of large ZrO2 islands over the alumina surface. The use of a carrier with a homogeneous Zr distribution had however, a detrimental effect. Moreover, a faster initial deactivation rate was observed for the Zr-promoted catalysts, fact that may explain this contradictory effect of Zr on activity. Finally, the addition of Zr showed a clear enhancement of the selectivity to long chain hydrocarbons and ethylene, especially when Zr was well dispersed.

    OriginalspråkOdefinierat/okänt
    Sidor (från-till)1285–1298
    TidskriftTopics in Catalysis
    Volym60
    Utgåva17-18
    DOI
    StatusPublicerad - 2017
    MoE-publikationstypA1 Tidskriftsartikel-refererad

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