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

J. Z. Luo; L. Z. Gao; Y. L. Leung; Chak Tong AU

doi:10.1023/a:1019035220233

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

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

141 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 language	English
Pages (from-to)	91-97
Number of pages	7
Journal	Catalysis Letters
Volume	66
Issue number	1-2
DOIs	https://doi.org/10.1023/a:1019035220233
Publication status	Published - May 2000

Scopus Subject Areas

Catalysis
General Chemistry

User-Defined Keywords

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

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10.1023/a:1019035220233

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title = "The decomposition of NO on CNTs and 1 wt% Rh/CNTs",

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.",

keywords = "Carbon nanotubes (CNTs), CNTs-supported rhodium catalysts, NO decomposition",

author = "Luo, {J. Z.} and Gao, {L. Z.} and Leung, {Y. L.} and AU, {Chak Tong}",

year = "2000",

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T1 - The decomposition of NO on CNTs and 1 wt% Rh/CNTs

AU - Luo, J. Z.

AU - Gao, L. Z.

AU - Leung, Y. L.

AU - AU, Chak Tong

PY - 2000/5

Y1 - 2000/5

N2 - 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.

AB - 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.

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KW - NO decomposition

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

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