Abstract
Abstract Carbon nanofiber supported Fischer-Tropsch catalysts with different cobalt particle sizes (2.6-16 nm) have been studied with steady-state isotopic transient kinetic analysis (SSITKA) at 210 °C, H 2 /CO = 10. Previous studies with these catalysts for the Fischer-Tropsch synthesis had shown a strong size dependency of the surface-specific activity. From the SSITKA study it appeared that with decreasing particle size, the CH x surface residence time increased from 10 (>6 nm) to 22 seconds (2.6 nm). For the CO residence time, an opposite trend was found. Moreover, both the CH x and CO surface coverage decreased as function of particle size. These findings lead us a step closer to the origin of the cobalt particle size effect.
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