Abstract
The effects of Mg, La and Ca promoters on primary and secondary CO 2 and H 2O formation pathways during Fischer-Tropsch synthesis on precipitated Fe/Cu/SiO 2 catalysts are investigated. The chemisorbed oxygen atoms in the primary pathway formed in the CO dissociation steps reacted with co-adsorbed hydrogen or carbon monoxide to produce H 2O and CO 2, respectively. The secondary pathway was the water-gas shift reaction. The results indicated that the CO 2 production led to an increase in both primary and secondary pathways, and H 2O production decreased when surface basicity of the catalyst increased in the order Ca > Mg > La.
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