Heterogeneous catalytic production and mechanical resistance of nanotubes prepared on magnesium oxide supported Co-based catalysts

I. Willems, Z. Kónya, A. Fonseca, J. B.Nagy

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

MgO-supported catalysts are used to produce high yield carbon nanotubes with few walls by the catalytic decomposition of acetylene. Low and high resolution transmission electron microscopy (TEM and HRTEM, respectively) reveals that the tubes possess many irregularities in their wall structure and that they appear as aggregates. The outer diameter of the multi-wall carbon nanotubes (MWNTs) obtained by this procedure is in the order of 5-10 nm while the inner diameter is less than 4 nm. Their resistance strongly depends on the post-synthetic treatments made upon them. Raw material obtained after synthesis is insensitive to ball-milling and tubes remain packed. The same feature appears after grinding the sample, treated with a concentrated acid in order to remove the support and the catalytic metal particles. The easy breaking of the tubes occurs after specific treatment of the sample.

Original languageEnglish
Pages (from-to)229-233
Number of pages5
JournalApplied Catalysis A: General
Volume229
Issue number1-2
DOIs
Publication statusPublished - Apr 10 2002

Keywords

  • CCVD technique
  • Carbon nanotubes
  • Heterogeneous catalysis

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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