Most recently, a breakthrough in the selective production of
lower olefins from synthesis has been reported [23,25]. Sodiumand
sulfur-promoted iron catalysts prepared using support
materials with weak interaction toward iron have displayed high
activities and light olefins selectivities with a low methane production
and an excellent mechanical and chemical stability [23,25].
However, still limited information is available about the effect of
sodium, sulfur, or a combination of both promoters on supported
catalysts studied under the stringent reaction conditions used for
the production of lower olefins from CO-rich synthesis gas. Most
of the above-mentioned promoter studies have been performed
on precipitated or fused catalysts at temperatures lower than
300 C.
Most recently, a breakthrough in the selective production oflower olefins from synthesis has been reported [23,25]. Sodiumandsulfur-promoted iron catalysts prepared using supportmaterials with weak interaction toward iron have displayed highactivities and light olefins selectivities with a low methane productionand an excellent mechanical and chemical stability [23,25].However, still limited information is available about the effect ofsodium, sulfur, or a combination of both promoters on supportedcatalysts studied under the stringent reaction conditions used forthe production of lower olefins from CO-rich synthesis gas. Mostof the above-mentioned promoter studies have been performedon precipitated or fused catalysts at temperatures lower than300 C.
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