The decomposition of NO on CNTs and 1 wt% Rh/CNTs

J. Z. Luo, L. Z. Gao, Y. L. Leung, Chak Tong AU*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

132 Citations (Scopus)

Abstract

Carbon nanotubes (CNTs) and CNTs-supported rhodium were tested as catalysts for NO decomposition. For the fresh catalysts, 100% NO conversion was achieved at 600 °C over CNTs; when I wt% Rh was loaded on CNTs; 100% NO conversion was achieved at 450 °C. If the catalysts were pre-reduced in H2 at or above 300 °C, 100% NO conversions were observed at 300 °C, XPS investigation indicated that there was still metallic rhodium (BE = 307.2 eV) on Rh/CNTs after heating in air at 500 °C for 2 h and after the NO decomposition reaction. As for a I wt% Rh/Al2O3 sample, the rhodium (BE = 308.2 eV) was completely in the form of Rh2O3 after similar treatments. These results suggest that compared to γ-Al2O3, the CNTs material is more capable of keeping the rhodium in its metallic state. The results obtained in H2-TPR studies support this conclusion. In addition, TEM investigation revealed that the rhodium particles distributed rather evenly over CNTs with a particle diameter of around 8 nm. We propose that CNTs can be used as a material for the facilitation of NO decomposition.

Original languageEnglish
Pages (from-to)91-97
Number of pages7
JournalCatalysis Letters
Volume66
Issue number1-2
DOIs
Publication statusPublished - May 2000

Scopus Subject Areas

  • Catalysis
  • Chemistry(all)

User-Defined Keywords

  • Carbon nanotubes (CNTs)
  • CNTs-supported rhodium catalysts
  • NO decomposition

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