Transport-enhanced $alpha;-olefin readsorption pathways in Ru-catalyzed hydrocarbon synthesis

C1 Chemistry for the Production of Ultra-Clean Liquid Transportation Fuels and Hydrogen

“…This increase in residence time of α-olefins inside the catalyst pores can lead to secondary reaction of the olefins such as hydrogenation and isomerization to form normal paraffins and branched products (Yokota et al 1990; Fan et al 1992). This production of paraffins and isomers terminates the chain-growth process (Iglesia et al 1991) resulting in lower chain growth. SCF-FTS operation, on the other hand, results in elimination of multiple phases as well as improved extraction and removal of α-olefins from the catalyst pores thereby decreasing secondary reactions and promoting chain growth.…”

Fischer–Tropsch Synthesis Over Zr-Promoted Co/γ-Al2O3 Catalysts

“…Finally, it may be interesting to mention that this significantly higher ethylene-to-ethane ratio found for the CoZrAl ME, suggests that ethylene re-adsorption and further polymerization [65] is inhibited by the presence of Zr. In consequence, the higher SC5+ observed when adding Zr, is likely to be due to an enhancement of the primary polymerization activity but not to an enhancement of secondary reactions.…”

Extension of the Single-Event Methodology to Metal Catalysis: Application to Fischer-Tropsch Synthesis

“…Such deviations have been observed for iron, cobalt and ruthenium catalysts and have been interpreted as the superposition of two or more ASF distributions, attributed to different factors, e.g., the existence of structurally different sites leading to different growth probabilities [18] or the existence of more than one chain growth mechanism [19]. In general, the most accepted explanation is the re-adsorption and re-incorporation of 1-alkenes in the chain growth [17,[19][20][21].…”