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Alumina supported cobalt–palladium catalysts for the reduction of NO by methane in stationary sources |
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| Authors: | Rui Marques, Kaoutar El Kabouss, Patrick Da Costa, St phanie Da Costa, Franck Delacroix,G rald Dj ga-Mariadassou |
| Affiliation: | aLaboratoire de Réactivité de Surface, CNRS UMR 7609, Case 178, Université P. et M. Curie, 4 Place Jussieu, 75252 Paris Cedex 05, France bITODYS, CNRS UMR 7086, Groupe LCMDC, Université Paris 7-Denis Diderot, 2, Place Jussieu, 75251 Paris Cedex 05, France cGaz de France, Direction de la recherche, 361 av. du Président Wilson, B.P. 33, 93211 La Plaine Saint-Denis Cedex, France dADEME, 2 Square La Fayette, 49004 Angers, France |
| Abstract: | In order to improve a “Three Function Catalysts Model”, the present paper deals with alumina based catalysts containing cobalt and palladium for the NO reduction by methane. The deNOx temperature window was estimated by adsorption and subsequent desorption of NO in lean conditions. Two NOx desorption peaks were detected for both catalysts. For Pd(0.63)Co(0.58)/Al2O3, the two desorption peaks appeared at 205 and 423 °C, whereas for Pd(0.14)Co(0.57)/Al2O3, the maxima desorption temperature peaks were at 205 and 487 °C. In addition, NO oxidation was also studied to evaluate the catalyst first function. It was found that, the oxidation begins on Co–Pd/Al2O3 around 250 °C. On Pd(0.63)Co(0.58)/Al2O3, 8% of deNOx were found in the range of the second NOx desorption peak temperature (410 °C). During TPSR, CxHyOz species such as formaldehyde were detected. These oxygenate species are the reactive intermediate for deNOx by methane. |
| Keywords: | Stationary sources Methane deNOx Three-function model |
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