Abstract
Abstract The Fischer-Tropsch hydrocarbon synthesis: n CO +(2n+2) H 2 → C n H 2n+2 +n H 2 O was discovered in 1923 and is most effectively catalyzed by iron, cobalt and ruthenium. Nickel is an excellent catalyst for methanation, the special case where n=1. We argue that surface science studies have established the key role of carbon monoxide dissociation in Fischer-Tropsch synthesis and have also been important in identifying majority surface species present during reaction. The relationship between surface and bulk carbide stability is then discussed. The lack of useful surface science evidence on the nature of the polymerization step is considered, relevant information from organometallic chemistry is outlined and a new mechanism tentatively proposed. Finally, the role of promoters such as alkali metals and of electronegative poisons is explored briefly.
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