Infrared study of nitrogen monoxide adsorption on palladium ion-exchanged ZSM-5 catalysts |
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| Authors: | Claude Descorme Patrick Gélin Michel Primet Christine Lécuyer |
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| Affiliation: | (1) Laboratoire d'Application de la Chimie à l'Environnement, UMR 9977 CNRS, Université Claude Bernard Lyon I, 43, Boulevard du 11 Novembre 1918, 69622 Villeurbanne Cedex, France;(2) GAZ DE FRANCE, Direction de la Recherche, CERSTA, 361, avenue du Président Wilson, PO Box 33, 93211 La Plaine St-Denis Cedex, France |
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| Abstract: | The adsorption of NO at room temperature on a H-ZSM-5 catalyst exchanged with Pd(NH3)
4
2+
complex and activated in oxygen at 773 K has been examined by FTIR spectroscopy. After the oxidizing treatment, the Pd tetrammine complex decomposed into Pd(II) ions and/or Pd(II) hydroxyl complexes dispersed in the zeolite channels. The subsequent adsorption of NO at room temperature led to the reduction of Pd(II) to Pd(I) entities, resulting in the formation and adsorption of NO2 on H-ZSM-5. The Pd(I) entities were shown to adsorb NO and form mononitrosyl complexes dispersed in the zeolite porosity and characterized by a single infrared absorption band at 1881 cm–1. The Pd(I) mononitrosyl complex was shown to reversibly coordinate water and NO2 molecules. The resulting nitrosyl complex was characterized by a single NO vibration band at 1836 cm–1. |
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| Keywords: | palladium ZSM-5 zeolite FTIR spectroscopy NO adsorption TPD |
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