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A model study on the carburization process of iron-based Fischer–Tropsch catalysts using in situ TEM–EELS

Paper ID Volume ID Publish Year Pages File Format Full-Text
47118 46459 2011 7 PDF Available
Title
A model study on the carburization process of iron-based Fischer–Tropsch catalysts using in situ TEM–EELS
Abstract

In order to elucidate the activation mechanism of iron based Fischer–Tropsch catalysts, we performed in situ nanoscale structural and compositional analysis during carburization in CO atmosphere. We found that inside an ETEM at 20 Torr CO, hematite reduces while severe sintering occurs. This sintering is enhanced by low pressure conditions in combination with CO gas. The reduction inside the ETEM is so effective that metallic iron can be formed. During the process, about 50 nm sized iron carbide crystallites grow out of the iron (oxide) particles. Upon prolonged reaction, these newly formed crystallites reduce in size to about 5–30 nm. In contrast to what has been described in the literature until now, no carbon deposits were found on the outer rim of these iron carbides at high temperature conditions. Note however that, in contrast to our measurements, previous studies involved catalysts that were cooled or passivated prior to (TEM) analysis.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ During carburization inside an ETEM at 20 Torr CO, hematite precursors are reduced. ▶ During, or shortly after the reduction of hematite, severe sintering occurs. ▶ The reduction inside the ETEM is so effective that metallic iron can be formed. ▶ No carbon deposits were found on the outer rim of the iron carbides.

Keywords
Fischer–Tropsch; Carburization; TEM–EELS
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A model study on the carburization process of iron-based Fischer–Tropsch catalysts using in situ TEM–EELS
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 102, Issues 3–4, 22 February 2011, Pages 521–527
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