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Efficient synthesis of aligned nitrogen-doped carbon nanotubes in a fluidized-bed reactor

Paper ID Volume ID Publish Year Pages File Format Full-Text
55486 47055 2012 10 PDF Available
Title
Efficient synthesis of aligned nitrogen-doped carbon nanotubes in a fluidized-bed reactor
Abstract

Vertically aligned nitrogen-doped carbon nanotubes (NCNTs) with uniform size distribution, large aspect ratio, good orientation, and high purity were employed as novel platforms to understand the dopant-induced perturbations and found widely applications in catalysis, electrochemistry, energy conversion and storages. However, the efficient way to synthesis CNTs with ordered alignment in large scale is still a challenge. We reported NCNTs were efficiently synthesized on a lamellar vermiculite catalyst in a fluidized-bed reactor. The catalysts and as-grown products can maintain good fluidization state during the whole growth process. The intercalated growth mode prevented the NCNT arrays from the disturbance of particle collisions in the fluidized bed. With the introduction of nitrogen precursor, N atoms were doped into CNTs and formed NCNTs with bamboo-like structure. The content of N doping can be tuned in a range of 1.55–4.23% and the distribution of N-containing functional groups can also be modified by changing either the growth temperatures or nitrogen sources (NH3, 1,2-ethylenediamine, and pyridine). We explored the growth temperature ranging from 650 to 800 °C. High growth temperature led to a high NCNT yield (2.95 gNCNT/gcat h), large NCNT diameter (about 20 nm), and high graphitization degree. This provides a potential way for the controllable mass production of aligned NCNTs for applications in catalysis, materials science, energy conversion and storage, etc.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (512 K)Download as PowerPoint slideHighlights► Synthesize aligned N-doped carbon nanotubes on lamellar vermiculite catalysts. ► Process can be realized in fluidized-bed reactor for large scale production. ► N-containing functional groups can be modified by growth temperatures. ► The process was compatible with both gaseous and liquid carbon and nitrogen source.

Keywords
Carbon nanotubes; Fluidized bed; Doped materials; Chemical vapor deposition; Nanotechnology
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Efficient synthesis of aligned nitrogen-doped carbon nanotubes in a fluidized-bed reactor
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 186, Issue 1, 1 June 2012, Pages 83–92
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