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The mechanism of the Fischer–Tropsch reaction over supported cobalt catalysts

✍ Scribed by Márton Kollár; Adriana De Stefanis; Hanna E. Solt; Magdolna R. Mihályi; József Valyon; Anthony A.G. Tomlinson

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
887 KB
Volume
333
Category
Article
ISSN
1381-1169

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✦ Synopsis

Natural gas and coal are converted to fuels by the Fischer-Tropsch reaction, i.e., by reacting CO with H 2 , the currently accepted mechanism involving surface carbide formation. We have monitored the adsorbed species and their evolution during Fischer-Tropsch reaction on the commercial catalyst Pt,Co/␥-Al 2 O 3 (as a standard), on Co/alumina-pillared montmorillonite (Co,Al-EFW) and its beidellite analogue (both are tri-octahedral smectite clays, but beidellite possesses tetrahedrally coordinated Al in the sheets) via optical diffuse reflectance (DRS 1 ) and variable temperature in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS 2 ). We show that in this case over Pt/Co-␥-Al 2 O 3 , under model conditions, H 2 reacts with CO forming H-C O bridges over [Co-O 2 -Co] units; this transition state moiety also involves adjacent matrix Al-O-CO units. Subsequent stages provide differing oxygenate species via concerted acid-base reactions. The early stages of the Fischer-Tropsch synthesis thus do not involve surface carbide species and surface oxygenates are generated via concerted reaction of support surface Al-OH with the above HCO-bridging binuclear Co 2+ unit.

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