A kinetic study of NOx reduction over Pt/SiO2 model catalysts with hydrogen as the reducing agent |
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Authors: | Lindholm Anna Currier Neal W. Yezerets Aleksey Olsson Louise |
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Affiliation: | 1.Competence Centre for Catalysis, Chalmers University of Technology, SE-412 96, G?teborg, Sweden ;2.Cummins Inc., 1900 McKinley Ave, MC 50183, Columbus, IN, 47201, USA ; |
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Abstract: | Flow reactor experiments and kinetic modeling have been performed in order to study the mechanism and kinetics of NOx reduction over Pt/SiO2 catalysts with hydrogen as the reducing agent. The experimental results from NO oxidation and reduction cycles showed that N2O and NH3 are formed when NOx is reduced with H2. The NH3 formation depends on the H2 concentration and the selectivity to NH3 and N2O is temperature dependent. A previous model has been used to simulate NO oxidation and a mechanism for NOx reduction is proposed, which describes the formation/consumption of N2, H2O, NO, NO2, N2O, NH3, O2 and H2. A good agreement was found between the performed experiments and the model. |
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Keywords: | NOx reduction hydrogen Pt/SiO2 kinetic modeling NH3 N2O N2 |
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