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Particle size effects in Fischer–Tropsch synthesis by cobalt

Paper ID Volume ID Publish Year Pages File Format Full-Text
55442 47053 2012 7 PDF Available
Title
Particle size effects in Fischer–Tropsch synthesis by cobalt
Abstract

In order to study the intrinsic particle size effect of Co catalysts in Fischer–Tropsch (FT) synthesis, a series of Co/SiO2 model catalysts with various metal coverages (0.25–6.0 ML), corresponding to sizes in the range of 1.4–10.5 nm were prepared in an ultrahigh vacuum chamber and tested at 513 K under atmospheric pressure in a batch reactor. The Co particle size distribution and the number of active sites were estimated from the TEM images. Kinetic data and post-reaction XPS spectra showed that for the small Co particles (1.4–2.5 nm), the Co surface was readily oxidized by water vapor, while for the relatively large Co particles (3.5–10.5 nm), such oxidation was not evident. The oxidation for the small Co particles leads to lower TOF and higher CH4 selectivity, while both reactivity and selectivity were relatively constant for the relatively large Co particles. The lack of intrinsic particle size effect for the metallic Co particles in the range of 3.5–10.5 nm is consistent with structure insensitivity in FT synthesis.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (262 K)Download as PowerPoint slideHighlights► XPS study on the cobalt Fischer–Tropsch (F–T) synthesis catalysts. ► Co/SiO2 model catalysts with monodispersed Co particles in the range of 1.4–10.5 nm. ► The rather small Co particles (1.4–2.5 nm) were oxidized by water vapor product. ► No particle size effects in F–T for the relatively large Co particles (3.5–10.5 nm). ► The importance of exploring the particle size effect on the well-defined surface.

Keywords
Particle size; FT; Co/SiO2 catalyst; Model catalyst; Oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 181, Issue 1, 12 February 2012, Pages 75–81
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