NDLI: Highly Selective and Active Niobia-Supported Cobalt Catalysts for Fischer

Content Provider	Springer Nature Link
Author	den Otter, Jan H. de Jong, Krijn P.
Copyright Year	2013
Abstract	The performance of Co/Nb$_{2}$O$_{5}$ was compared to that of Co/γ-Al$_{2}$O$_{3}$ for the Fischer–Tropsch synthesis at 20 bar and over the temperature range of 220–260 °C. The C$_{5+}$ selectivity of Nb$_{2}$O$_{5}$-supported cobalt catalysts was found to be very high, i.e. up to 90 wt% C$_{5+}$ at 220 °C. The activity per unit weight cobalt was found to be similar for Nb$_{2}$O$_{5}$ and γ-Al$_{2}$O$_{3}$-supported catalysts at identical reaction temperature. However, due to the low porosity of crystalline Nb$_{2}$O$_{5}$, the cobalt loading was limited to 5 wt% and consequently the activity per unit weight of catalyst was lower than of Co/γ-Al$_{2}$O$_{3}$ catalysts with higher cobalt loadings. This low activity was largely compensated by increasing the reaction temperature, although the C$_{5+}$ selectivity decreased upon increasing reaction temperature. Due to the high intrinsic C$_{5+}$ selectivity, Nb$_{2}$O$_{5}$-supported catalysts could be operated up to ~250 °C at a target C$_{5+}$ selectivity of 80 wt%, whereas γ-Al$_{2}$O$_{3}$-supported catalysts called for an operation temperature of ~210 °C. At this target C$_{5+}$ selectivity, the activity per unit weight of catalyst was found to be identical for 5 wt% Co/Nb$_{2}$O$_{5}$ and 25 wt% Co/Al$_{2}$O$_{3}$, while the activity per unit weight of cobalt was a factor of four higher for the niobia-supported catalyst.
Starting Page	445
Ending Page	450
Page Count	6
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	57
Issue Number	6-9
e-ISSN	15729028
Language	English
Publisher	Springer US
Publisher Date	2013-11-19
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fischer–Tropsch Niobia Selectivity Reaction temperature Catalysis Physical Chemistry Pharmacy Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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