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Quantitative study of catalytic activity and catalytic deactivation of Fe–Co/Al2O3 catalysts for multi-walled carbon nanotube synthesis by the CCVD process

Paper ID Volume ID Publish Year Pages File Format Full-Text
42057 45909 2010 9 PDF Available
Title
Quantitative study of catalytic activity and catalytic deactivation of Fe–Co/Al2O3 catalysts for multi-walled carbon nanotube synthesis by the CCVD process
Abstract

The catalytic deactivation during multi-walled carbon nanotube (MWNT) synthesis by the CCVD process and the influence of hydrogen on it were quantified. Initial specific reaction rate, relative specific productivity and catalytic deactivation were studied. Carbon source was ethylene, and a bimetallic iron–cobalt catalyst supported on alumina was used. The catalytic deactivation was modeled by a decreasing hyperbolic law, reflecting the progressive accumulation of amorphous carbon on active sites. While the initial specific reaction rate was found not to be influenced by hydrogen, catalytic deactivation was found to be modified in the presence of hydrogen, which delayed and slowed down the deactivation by avoiding amorphous carbon deposition, thus leading to a greater relative specific productivity of carbon nanotubes.

Graphical abstractThe catalytic deactivation during MWNT synthesis by the CCVD process was quantified. The catalytic deactivation was modeled by a decreasing hyperbolic law, reflecting the progressive accumulation of amorphous carbon on active sites. The catalytic deactivation was found to be modified with hydrogen, which delayed and slowed down the deactivation by avoiding amorphous carbon deposition.Figure optionsDownload full-size imageDownload high-quality image (63 K)Download as PowerPoint slide

Keywords
Carbon nanotubes; Catalytic deactivation; Modeling
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Quantitative study of catalytic activity and catalytic deactivation of Fe–Co/Al2O3 catalysts for multi-walled carbon nanotube synthesis by the CCVD process
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 382, Issue 1, 30 June 2010, Pages 1–9
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