NOx removal by rhodium catalysts supported on carbon nanotubes: Evidence for the stoichiometric reduction of NO2 and NO by the carbon support

Hans Beyer; Klaus Köhler

doi:10.1016/j.apcatb.2010.02.008

NO_x removal by rhodium catalysts supported on carbon nanotubes: Evidence for the stoichiometric reduction of NO₂ and NO by the carbon support

Hans Beyer, Klaus Köhler

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Technical University of Munich

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27 Scopus citations

Abstract

The catalytic removal of NO and NO₂ over rhodium particles supported on carbon nanotubes (Rh/CNT) was studied in the absence and presence of oxygen. It was found that the stoichiometric oxidation of the carbon support by adsorbed oxygen deriving from the rhodium-catalyzed scission of NO is crucial to achieve steady-state conversion of NO_x. The proposed reaction pathway is verified by complete nitrogen and oxygen balances. In the absence of excess oxygen, Rh/CNT catalysts exhibit high activities in the catalytic reduction of NO and NO₂ with the carbon support acting as the reducing agent. Oxidative pretreatment of the CNT support enhances the catalytic activity. The lifetime of the catalysts is limited by the stoichiometric oxidation of the support material. The structural degradation during the time on stream is evidenced by transmission electron microscopy.

Original language	English
Pages (from-to)	110-116
Number of pages	7
Journal	Applied Catalysis B: Environmental
Volume	96
Issue number	1-2
DOIs	https://doi.org/10.1016/j.apcatb.2010.02.008
State	Published - 26 Apr 2010

Keywords

CNT
Decomposition
NO
NO
NO
Reduction
Rhodium catalyst

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10.1016/j.apcatb.2010.02.008

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abstract = "The catalytic removal of NO and NO2 over rhodium particles supported on carbon nanotubes (Rh/CNT) was studied in the absence and presence of oxygen. It was found that the stoichiometric oxidation of the carbon support by adsorbed oxygen deriving from the rhodium-catalyzed scission of NO is crucial to achieve steady-state conversion of NOx. The proposed reaction pathway is verified by complete nitrogen and oxygen balances. In the absence of excess oxygen, Rh/CNT catalysts exhibit high activities in the catalytic reduction of NO and NO2 with the carbon support acting as the reducing agent. Oxidative pretreatment of the CNT support enhances the catalytic activity. The lifetime of the catalysts is limited by the stoichiometric oxidation of the support material. The structural degradation during the time on stream is evidenced by transmission electron microscopy.",

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AU - Köhler, Klaus

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AB - The catalytic removal of NO and NO2 over rhodium particles supported on carbon nanotubes (Rh/CNT) was studied in the absence and presence of oxygen. It was found that the stoichiometric oxidation of the carbon support by adsorbed oxygen deriving from the rhodium-catalyzed scission of NO is crucial to achieve steady-state conversion of NOx. The proposed reaction pathway is verified by complete nitrogen and oxygen balances. In the absence of excess oxygen, Rh/CNT catalysts exhibit high activities in the catalytic reduction of NO and NO2 with the carbon support acting as the reducing agent. Oxidative pretreatment of the CNT support enhances the catalytic activity. The lifetime of the catalysts is limited by the stoichiometric oxidation of the support material. The structural degradation during the time on stream is evidenced by transmission electron microscopy.

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NO_x removal by rhodium catalysts supported on carbon nanotubes: Evidence for the stoichiometric reduction of NO₂ and NO by the carbon support

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Keywords

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