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Fischer–Tropsch catalysts deposited with size-controlled Co3O4 nanocrystals: Effect of Co particle size on catalytic activity and stability

Paper ID Volume ID Publish Year Pages File Format Full-Text
41264 45883 2012 9 PDF Available
Title
Fischer–Tropsch catalysts deposited with size-controlled Co3O4 nanocrystals: Effect of Co particle size on catalytic activity and stability
Abstract

The influences of cobalt particle size on the Fischer–Tropsch reaction have been studied by using pre-synthesized cobalt oxide nanoparticles. Cobalt oxide nanoparticles in the range of 3–16 nm were synthesized by reacting colloidal solution of Co3O4 at the different reaction temperatures from 150 to 250 °C and stabilized by capping agent. The nanoparticles were impregnated on γ-Al2O3 to prepare 5 wt% Co/Al2O3 catalysts and compared with the catalysts prepared by conventional methods. The reduction degree by TPR and O2-uptake increased with the increase in the cobalt crystal size from 4.8 to 17.5 nm, however H2-uptake decreased. The rapid growth in the catalytic activity was observed when the cobalt crystal size increased from 4.8 to 9.3 nm and then the activity decreased with further increase in crystal size showing volcano shape in catalytic activity. The catalyst with the cobalt particle size of 9.3 nm showed higher CO conversion, better C5+ selectivity and lower methane conversion. These size-defined cobalt catalysts showed considerably higher FTS activity and better TOF (S−1) than conventional catalysts and with the increase in the cobalt particle size, their deactivation rates also decreased as well even after 54 h on stream.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (85 K)Download as PowerPoint slideHighlights► Co3O4 nanocrystals embedded catalysts x-CoAl prepared with different crystal sizes. ► x-CoAl catalysts show superior activity for Fischer–Tropsch reaction. ► Uniform distribution of defined size cobalt particles enhances the efficiency. ► Rapid growth in the activity with increase in the cobalt crystal size up to 9.3 nm. ► With the increase in the crystals size deactivation rate turns negligible.

Keywords
Cobalt oxide nanocrystals; Co/Al2O3 catalysts; Crystal size effect; FT synthesis
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Fischer–Tropsch catalysts deposited with size-controlled Co3O4 nanocrystals: Effect of Co particle size on catalytic activity and stability
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 411–412, 16 January 2012, Pages 15–23
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