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

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

Applied Energy, 2013, vol. 111, issue C, 267-276

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.

Keywords: Syngas; Si/Fe–Cu–K catalysts; Potassium effect; CO-hydrogenation; Olefin selectivity; Fuel (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1016/j.apenergy.2013.04.070

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