TY - JOUR
T1 - Fischer–Tropsch synthesis over Zr-promoted Co/γ-Al2O3 catalysts
AU - Barrientos, Javier
AU - Garcilaso, Victoria
AU - Venezia, Baldassarre
AU - Aho, Atte
AU - Antonio Odriozola, José
AU - Boutonnet, Magali
AU - Järås, Sven
N1 - tk.
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
U2 - 10.1007/s11244-017-0813-1
DO - 10.1007/s11244-017-0813-1
M3 - Artikel
SN - 1022-5528
VL - 60
SP - 1285
EP - 1298
JO - Topics in Catalysis
JF - Topics in Catalysis
IS - 17-18
ER -