Estimates of rate coefficients for elementary processes occurring during Fischer-Tropsch synthesis over Ru/TiO[sub 2]

Journal Article · Tue Mar 01 04:00:00 EST 1994 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(94)90027-2· OSTI ID:6798270

Komaya, Takashi; Bell, A T ^[1]

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1. Lawrenece Berkeley Lab., CA (United States)

The dynamics of elementary processes involved in Fischer-Tropsch synthesis of hydrocarbons over Ru/TiO[sub 2] have been determined from the analysis of data from both steady-state and transient-response experiments. Both types of experiments were carried out with different feed catalyst bed residence times to assess the effects of olefin readsorption on the dynamics of chain initiation, propagation, and termination. Strong evidence was found for the rapid reentry of ethylene into the chain growth process. The reentry of C[sub 3+] olefins, though, is negligible for the conditions studies. The holdup of hydrocarbons in a weakly physisorbed state was found to be significant for C[sub 6+] products and must be accounted for in the simulation of transient-response experiments. When the effects of ethylene readsorption and C[sub 6+] holdup are properly taken into account, the rate coefficients for chain initiation, propagation, and termination, determined from simulations of the transient-response experiments, are independent of carbon number and catalyst-bed residence time. Rate coefficients for the readsorption of ethylene, the depolymerization of adsorbed ethyl groups, and the dehydrogenation of methyl of methylene groups were also determined from simulations of the transient-response experiments. 31 refs., 15 figs., 1 tab.

• OSTI ID: 6798270
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 146:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

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ALKENES
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
ELEMENTS
FISCHER-TROPSCH SYNTHESIS
HETEROGENEOUS CATALYSIS
HYDROCARBONS
KINETICS
METALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
REACTION KINETICS
RUTHENIUM
SYNTHESIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS