Abstract
Abstract Transient response isotopic tracer experiments have been used to study chain growth during Fischer-Tropsch synthesis over a Ru/TiO 2 catalyst. This involves observation of the incorporation of 13 C into reaction products after an abrupt switch from 12 CO/D 2 to 13 CO/D 2 in the feed. Values for the rate constants for initiation, propagation and termination are determined by fitting theoretically generated curves to the observed transient response. The rate coefficient for chain initiation is found to be independent of temperature, whereas the rate coefficients for propagation and termination increase with temperature. The activation energy for chain termination is significantly higher than that for chain propagation, explaining the observed decrease in chain growth probability, α, with increasing temperature. Coverages by reaction intermediates are also estimated. The dominant species are monomeric building units which occupy 0.2–0.6 ML. Alkyl species that are the direct hydrocarbon product precursors occupy
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