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In industrial chemistry, an efficiency of a chemical process is defined as the obtained moles of the main product divided by the moles of the main limiting reactant & then multiplied by 100. If the chemical process is catalyzed, then efficiency is replaced by selectivity as a measure of the effectiveness of obtaining the desired products.
As you know, we use synthesis gas & vary the percentages of CO & H2 in order to get what we look for (e.g. liquid or waxy hydrocarbons). In such FT synthesis, both the type of catalyst & the reaction conditions play important roles in selectivity which is calculated as given by this good thesis from Netherland:
https://www.rug.nl/research/portal/files/9883465/thesis.pdf
F-T generally can by defined by Alpha with the relationship Mole frac Ci+1 = Alpha* Mole Frac Ci (Schulz-Flory distribution). This relationship generally needs some adjustment for C4 minus CH4 yield is always higher than alpha would predict there is often a dip at C2 (probably because it is reactive on both ends) and some minor disturbance at C3 ,C4 and possibly C5.
Fe based F-T will often produce Olefins and Alcohols in addition to parrafins especial for the lower carbon numbers.
Fe based F-T will often produce Olefins and Alcohols in addition to paraffins especial for the lower carbon numbers.
For any chemical reaction system, selectivity is defined as the change in the number of moles of the reference component in the main reaction (which results in the given product) to change in the number of moles of this component in all reactions. There may be one main reaction, there may be several such reactions. There may be one reference component, there may be several. Regards,
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