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Effect of chromium addition to the Co-MCM-41 catalyst in the synthesis of single wall carbon nanotubes

Paper ID Volume ID Publish Year Pages File Format Full-Text
42496 45928 2009 10 PDF Available
Title
Effect of chromium addition to the Co-MCM-41 catalyst in the synthesis of single wall carbon nanotubes
Abstract

This paper studies the effect of chromium addition to the Co-MCM-41 catalyst in the synthesis of single wall carbon nanotubes (SWNT). The molecular ratios between the two metals have been varied in the catalyst template and their effect on the synthesized SWNT distribution has been studied. By adding Cr to the Co-MCM-41 monometallic catalyst, the diameter distribution of the synthesized SWNT has shifted towards smaller diameter tubes. This shift was correlated with the development of a bimetallic oxide in the MCM-41 framework during catalyst synthesis. By use of fluorescence spectroscopy, the relative abundance of certain tube chiralities has been seen to increase in the bimetallic samples compared to the monometallic ones as for example the (6,5) nanotube.X-ray absorption analysis of the catalyst before, during and after the SWNT synthesis, suggested that the use of a less reducible oxide (chromium oxide) to anchor clusters of a nanotube growth catalyst (cobalt clusters) is an important general tool for engineering the resultant nanotube properties. The addition of chromium has been seen to affect both the reducibility of the cobalt ions and the size of the resultant particles during the SWNT synthesis process.

Graphical abstractIn this paper, we study the effect of chromium addition to the Co-MCM-41 catalyst in the synthesis of single wall carbon nanotubes (SWNT). The molecular ratios between the two metals were varied in the catalyst template and its effect on the synthesized SWNT distribution was studied compared to the monometallic Co-MCM-41 catalyst.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Carbon nanotubes; Diameter; Selectivity; Bimetallic; Catalyst; Cobalt; Chromium
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Effect of chromium addition to the Co-MCM-41 catalyst in the synthesis of single wall carbon nanotubes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 368, Issues 1–2, 31 October 2009, Pages 40–49
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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