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An attempt made for the selective production of C 2 -C 4 olefins directly from the synthesis gas (CO + H 2 ) has led to the development of a dual catalyst system having a Fischer-Tropsch (K/Fe-Cu/AlOx) catalyst and cracking (H-ZSM-5) catalyst operate in consecutive dual reactors. The flow rate (space velocity) and H 2 /CO molar ratio of the feed have been optimized for achieving higher CO conversions and olefin selectivities. The selectivity to C 2 -C 4 olefins is further enhanced by optimizing the reaction temperature in the second reactor (cracking), where the product exhibited 51% selectivity to C 2 -C 4 hydrocarbons rich in olefins (77%) with a stable time-on-stream performance in a studied period of 100 h.

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