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

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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 1 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 1 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.

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Authors and Affiliations

  1. Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong, PR China

    J.Z. Luo, L.Z. Gao & C.T. Au

  2. Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, Sichuan, 610041, PR China

    L.Z. Gao

  3. Department of Physics, Hong Kong Chinese University, NT, Hong Kong, PR China

    Y.L. Leung

Authors
  1. J.Z. Luo
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  2. L.Z. Gao
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  3. Y.L. Leung
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  4. C.T. Au
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Luo, J., Gao, L., Leung, Y. et al. The decomposition of NO on CNTs and 1 wt% Rh/CNTs. Catalysis Letters 66, 91–97 (2000). https://doi.org/10.1023/A:1019035220233

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