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CO-hydrogenation over silica supported iron based catalysts: Influence of potassium loading

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  • Das, Satyen Kumar
  • Mohanty, Pravakar
  • Majhi, Sachchit
  • Pant, Kamal Kishore

Abstract

Five different Fe–Cu/SiO2 catalysts were prepared by a combination of co-precipitation and wet impregnation technique at different K-loading ranging from 0 to 5wt.% for the conversion of syngas to liquid fuel. The physiochemical characterization of these catalysts was performed by using N2 adsorption, X-ray diffraction (XRD), H2-TPR, NH3-TPD, TEM, Inductive Couple Plasma Mass Spectroscopy (ICP-MS), and SEM–EDX to study the effect of potassium on the textural properties, structural change, reduction behavior, acidity and morphological change to the above K-loading catalysts. The effect of addition of potassium promoter was studied for CO-Hydrogenation in a fixed bed reactor simultaneously with the effect of promoter on the CO-conversion, selectivity and deactivation. The maximum catalytic activity was obtained from 1% K-loading and the catalytic activity decreased thereafter. The activity for water–gas shift (WGS) also enhanced with increasing K loading. The results revealed that increasing K loading decreases gaseous hydrocarbon formation and shifts selectivity to higher molecular weight hydrocarbons. Incorporation of potassium suppresses the hydrogenation activity of the Fe–Cu/SiO2 catalyst, leading to higher olefin yield in the products.

Suggested Citation

  • Das, Satyen Kumar & Mohanty, Pravakar & Majhi, Sachchit & Pant, Kamal Kishore, 2013. "CO-hydrogenation over silica supported iron based catalysts: Influence of potassium loading," Applied Energy, Elsevier, vol. 111(C), pages 267-276.
    • Handle: RePEc:eee:appene:v:111:y:2013:i:c:p:267-276
    DOI: 10.1016/j.apenergy.2013.04.070
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    1. Ding, Mingyue & Tu, Junling & Qiu, Minghuang & Wang, Tiejun & Ma, Longlong & Li, Yuping, 2015. "Impact of potassium promoter on Cu–Fe based mixed alcohols synthesis catalyst," Applied Energy, Elsevier, vol. 138(C), pages 584-589.

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