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Indium as a chemical promoter in Fe-based Fischer-Tropsch synthesis

Paper ID Volume ID Publish Year Pages File Format Full-Text
42353 45921 2010 8 PDF Available
Title
Indium as a chemical promoter in Fe-based Fischer-Tropsch synthesis
Abstract

The ability of indium to act as a chemical promoter in Fe-based FTS reaction was evaluated and compared to that of copper. Indium was chosen for study due its relationship to Cu through the ‘Knight'sMove’ relationship. N2 physisorption, temperature programmed reduction (TPR), X-ray diffraction (XRD) and diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) were employed to characterise the catalysts. “In situ” Fischer-Tropsch synthesis (FTS) reactions were also performed in a DRIFTS reactor. It was found via TPR studies that indium exhibited a similar ability to reduce Fe as found for copper. Results obtained from XRD and N2 physisorption experiments showed indium promoted catalysts give comparable results to those of copper promoted catalysts. However, indium decreased the % reducibility and CO adsorption ability of the Fe catalyst. Indium also lowered the FTS activity of the Fe-based catalyst, an effect ascribed to be associated with the low melting point of In. The effect of adding indium to a multi-promoted Fe-based FTS catalyst was also investigated. The addition of indium suppressed the reduction properties of the catalyst when H2 was employed as a reductant. When CO was employed as a reductant, the reduction/carburization properties were improved and resulted in a selectivity shift to heavy weight hydrocarbons during the FTS reaction. Adding indium to the multi-promoted catalyst also lowered the catalyst surface area which resulted in a decrease to the FTS activity. It appears that while the ‘Knight'sMove’ relationship is consistent with Cu and In both acting to enhance Fe reduction, the low In melting point determines the poor activity of the FT catalysts.

Graphical abstractThe ‘Knight's move’ relationship suggests that indium, like copper, should promote iron Fischer-Tropsch catalysts. Addition of indium to Fe and to Fe/SiO2/K2O catalysts revealed that while In did promote Fe reduction under H2, presumably by a spill-over mechanism, the FT activity decreased substantially in the presence of low melting In.Figure optionsDownload full-size imageDownload high-quality image (47 K)Download as PowerPoint slide

Keywords
Fischer-Tropsch synthesis (FTS); Fe-based catalyst; Indium promoter; Copper promoter
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 377, Issues 1–2, 1 April 2010, Pages 150–157
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us