How can we reduce the emission of methane and CO2 in fischer-tropsch olefin meanwhile by increasing the selectivity of olefins in presence of iron catalyst??
It is difficult to reduce the CO2 or CH4 concentration over iron catalyst. However, it has been shown that using high pressure compressed CO2 co fed with the syngas can reduce the emissions of the two.
The FTO-process typically proceeds over an iron-based catalyst when targeting low carbon number olefins as chemical feedstock. The Fischer-Tropsch process is a polymerization and methane formation is intrinsically linked to this process; limiting methane formation will increase the C5+-formation which is typically not desired in the FTO-process. It has been known that more methane is formed than predicted by the classical Anderson-Schulz-Flory distribution; it is in my mind currently not clear whether this 'extra' methane can be reduced or not, otherwise formulated does the FT-process following the simplified ASF-kinetics or not.
With respect to CO2-formation: the CO2-formation has been linked to the water-gas shift reaction and in our groups we have linked this to the transformation of magnetite to iron carbide during the Fischer-Tropsch synthesis. Reducing the formation of magnetite during the Fischer-Tropsch synthesis would result in a reduction in the CO2-formation. This could be done by modification of the catalytically active phase; we need to facilitate the removal of oxygen from the carbide phase (which is not easy).
Thanks gentlemen for your kind and prompt responses.
But what I have in my mind is that can we modify the composition of catalyst so that CO2 and methane get converted to olefins insitu..??
Yes. Our research team are working on some catalysts considering the synthesis of methanol and olefin simultaneously.
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