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Fischer–Tropsch synthesis over cobalt catalyst supported on carbon nanotubes in a slurry reactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
43691 45983 2008 9 PDF Available
Title
Fischer–Tropsch synthesis over cobalt catalyst supported on carbon nanotubes in a slurry reactor
Abstract

The potential of carbon nanotubes (CNTs) supported cobalt catalysts for Fischer–Tropsch (FT) reaction is discussed in this paper. Cobalt on carbon nanotube catalysts were prepared using the wet impregnation method with cobalt loading varying from 15 to 40 wt.%. The catalysts were characterized by BET, X-ray diffraction (XRD), H2 chemisorption, TPR, and transmission electron microscopy (TEM). The activity and selectivity of the catalysts were assessed using a continuous stirred tank reactor (CSTR). Most of the cobalt particles were homogeneously distributed inside the tubes and the rest on the outer of the CNTs. Carbon nanotubes as cobalt catalyst support was found to shift the reduction temperature of cobalt oxide species to lower temperatures. The strong metal–support interactions are reduced to a large extent and the reducibility of the catalysts improved significantly. CNT aided in well dispersion of metal clusters and average cobalt clusters size decreased. The hydrocarbon yield in the FT process obtained by CNT-supported cobalt catalyst is about 75% more than that obtained using cobalt on alumina supports. The maximum concentration of active surface Co° sites and FTS activity for CNT-supported catalysts are achieved at 40 wt.% cobalt loading. CNT caused a slight decrease in FTS product distribution to lower molecular weight hydrocarbons.

Graphical abstractCo/CNT catalysts for FTS were prepared with loading varying from 15 to 40 wt.%. Most of the cobalt particles were homogeneously distributed inside the tubes. CNT aided in well dispersion of metal clusters and average cobalt clusters size decreased. The FTS rate obtained by Co/CNT is about 75% more than that obtained by Co/Al2O3. The maximum FTS activity is achieved at 40 wt.%. CNT caused a slight decrease in FTS product distribution to lower molecular weight hydrocarbons.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Fischer–Tropsch; Cobalt; Carbon nanotube; Catalyst characterization
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Fischer–Tropsch synthesis over cobalt catalyst supported on carbon nanotubes in a slurry reactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 345, Issue 2, 1 August 2008, Pages 134–142
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