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Fundamental issues on practical Fischer–Tropsch catalysts: How surface science can help

Paper ID Volume ID Publish Year Pages File Format Full-Text
54133 46998 2014 7 PDF Available
Title
Fundamental issues on practical Fischer–Tropsch catalysts: How surface science can help
Abstract

•Surface carbon pins down mobile Co sub-carbonyls and stabilizes surface roughness.•Surface alkyne species are facile precursors for aromatic surface carbon during LT-FTS.•Polymeric carbon produced by FTS: aromatic core, attached to steps, with alkyl side chains.•FTS chain growth mechanism: chain initiation via CH + CH → HCCH.•Growth: alkyne HCCR → alkylidyne (CCH2R) + CH → alkyne (HCCCH2R).

The present article highlights the contribution of surface science and molecular modeling to the understanding of Fischer–Tropsch catalysis, in particular related to carbon-induced Co Fischer–Tropsch catalyst deactivation. The role of atomic and graphitic carbon in surface restructuring is discussed. Both forms of surface carbon stabilize surface roughness, while molecular CO promotes mobility of Co surface atoms. In a proposed chain growth mechanism on Co(0 0 0 1) chain elongation proceeds via alkylidyne + CH. The resulting acetylenic species is hydrogenated to alkylidyne, the route to further growth. (Cyclo-)polymerization of acetylenic species produces (aromatic) forms of polymeric surface carbon, a slow side reaction.

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Keywords
Carbon deposition; Catalyst deactivation; Fischer–Tropsch synthesis; FTS chain growth mechanism; Cobalt FTS
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Fundamental issues on practical Fischer–Tropsch catalysts: How surface science can help
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 228, 1 June 2014, Pages 106–112
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