Kinetic modeling of the slurry phase Fischer-Tropsch synthesis on iron catalysts
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Two different approaches to modeling of hydrocarbon product distribution for Fischer-Tropsch synthesis have been tested using results from experiments conducted under industrially relevant conditions in a slurry reactor on iron catalysts. The first approach (two active site model) is based on the assumption that there are two types of active sites on the catalyst surface: type-1, where primary growth of hydrocarbon intermediates occurs, and type-2, where reversible carbon atom number dependent readsorption of 1-olefins takes place. The readsorbed 1-olefins form alkyl intermediates, CnH2n+1, on the surface, which in turn can participate in several reactions: chain growth propagation, hydrogenation to n-paraffins, and dehydrogenation to 2-olefins. The second approach (one active site model) accounts for secondary readsorption of 1-olefins on type-1 sites only. Model predictions provide information on hydrocarbon product distribution over the wide range (C1to C50) of carbon numbers, and have been verified in experiments with several iron Fischer-Tropsch catalysts.
