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Reactivity of surface carbonaceous intermediates on an iron-based Fischer–Tropsch catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
42228 45916 2010 9 PDF Available
Title
Reactivity of surface carbonaceous intermediates on an iron-based Fischer–Tropsch catalyst
Abstract

The reactivities of surface carbonaceous intermediates on both a freshly reduced and a carbided iron-based Fischer–Tropsch catalyst were characterised using isotopic transient kinetic analysis (SSITKA), isothermal hydrogenation, and temperature programmed surface reactions. On both catalysts, carbon deposition occurred to the same extent but water formation and methane formation were faster on the carbided catalyst. More reaction intermediates for C2 hydrocarbon formation were detected at the start of the Fischer–Tropsch reaction on the freshly reduced catalyst. However, the CHs intermediate for methane formation and the CCHs intermediate for C2 hydrocarbon formation were found to be the most stable surface intermediates on both catalysts. Surface carbon (13Cs), deposited via the Boudouard reaction using 13CO, was active and was detected in the C2+ hydrocarbon products as the result of a coupling reaction with 12Cs rather than with 13Cs. Six distinct carbon pools (Cα1, Cα2, Cβ1, Cγ1, Cγ2, and Cδ1) were identified during isothermal and temperature programmed surface reactions. Graphitic carbon (Cδ1) has the highest coverage of all the surface carbonaceous species on the end of the run sample.

Graphical abstractThe reactivities of surface carbonaceous intermediates on a freshly reduced and on a carbided iron-based Fischer–Tropsch catalyst were characterised using the isotopic transient kinetic analysis (SSITKA) technique. The CHs intermediate for methane formation and the CCHs intermediate for C2 hydrocarbon formation were found to be the most stable surface intermediates on both catalysts.Figure optionsDownload full-size imageDownload high-quality image (213 K)Download as PowerPoint slide

Keywords
SSITKA; Fischer–Tropsch; Iron catalyst; Transient; Temperature programmed; Surface characterization
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Reactivity of surface carbonaceous intermediates on an iron-based Fischer–Tropsch catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 373, Issues 1–2, 31 January 2010, Pages 81–89
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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