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- 저자 : Saba Karimi (검색결과 1 건)
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Ahmad Tavasoli,Saba Karimi,Maryam Davari,Nazanin Nasrollahi,Tahereh Nematian 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
Alkalized MoS2 nanocatalysts supported on carbon nanotubes (CNTs) is prepared using microemultiontechnique with water-to-surfactant ratios of 1–4. The nanocatalysts were extensively characterized bydifferent methods and their activity and selectivity in higher alcohols synthesis (HAS) been assessed in afixed bed micro-reactor. The physico-chemical properties and performance of the nanocatalysts werecompared with the catalyst prepared by impregnation method. Very narrow particle size distributionhas been produced by the microemulsion technique at the relatively high loading of active metal(15 wt.% Mo). The TEM images showed that small Mo nanoparticles are confined inside the CNTs and theon the outer surface of the CNTs (2–7 nm). Using microemultion technique with water to surfactant ratioof one; the average MoO3 particle sizes decreased to 4.5 nm, the %dispersion increased to 60.75 and the%reduction increased by 43%. Also, the chemical interactions between K–Mo–O species increased,enhancing the conditions for the formation of alcohols. Activity and selectivity were found to bedependent on the catalyst preparation method and water to surfactant ratio. The %CO conversionincreased to 43.8%. The CNTs-supported MoO3–K2O nanocatalyst synthesized by the proposedmicroemulsion technique with water to surfactant ratio of one, decreased the hydrocarbons selectivityto 21.98% and increased the alcohols selectivity to 65.21%. Finally, using microemultion methoddramatically decreased the methanol selectivity and increased ethanol and other higher alcoholsselectivities.
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