Complementary Physicochemical Characterization by SAXS and 129Xe NMR Spectroscopy of Fe-ZSM-5: Influence of Morphology in the Selective Catalytic Reduction of NO
| Autor: | Ariel Guzmán-Vargas, Victor Lara, Enrique Lima, Gerard Delahay, Bernard Coq |
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| Přispěvatelé: | ESIQIE (ESIQIE), Instituto Politecnico Nacional [Mexico] (IPN), Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México (UNAM), Laboratoire de Matériaux Catalytiques et Catalyse en Chimie Organique (LMCCCO), Université Montpellier 1 (UM1)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
General Chemical Engineering
Analytical chemistry 02 engineering and technology 010402 general chemistry 01 natural sciences Industrial and Manufacturing Engineering Catalysis NO Adsorption iron Zeolite Chemistry Small-angle X-ray scattering Selective catalytic reduction General Chemistry Nuclear magnetic resonance spectroscopy SAXS [CHIM.CATA]Chemical Sciences/Catalysis Hematite 021001 nanoscience & nanotechnology NMR 0104 chemical sciences visual_art visual_art.visual_art_medium ZSM-5 0210 nano-technology SCR Nuclear chemistry |
| Zdroj: | Industrial and engineering chemistry research Industrial and engineering chemistry research, American Chemical Society, 2006, 45, pp.4163-4168. ⟨10.1021/ie0601596⟩ |
| ISSN: | 0888-5885 1520-5045 |
| Popis: | International audience; Fe-ZSM-5 catalysts were prepared by FeCl3 sublimation (CVD method) and impregnation in aqueous media. To describe the morphology of the iron species, the materials were characterized by XRD, SAXS, and 27Al and 129Xe NMR spectroscopy. In the catalysts prepared by impregnation, XRD detected large hematite particles at the external surface of the zeolite. In contrast, the Fe2O3 phase was not detectable by XRD in the materials prepared by CVD, indicating much smaller species. The 129Xe NMR results show that, in the CVD-prepared materials, the amount of free space inside the zeolite cavities was decreased appreciably by the presence of the Fe oxo species. Furthermore, 129Xe NMR spectroscopy reveals a sharp peak for the CVD-prepared material with Fe (3.8 wt %), indicating that this catalyst exhibits strong adsorption sites that are not detectable in the sample of similar Fe content that was prepared by impregnation. Morphology appears to be strongly affected by the method of preparation of the catalyst. The fractal dimension of the metal phase was associated with the catalytic activity in the selective catalytic reduction (SCR) of NO using ammonia and n-decane as reducing agents. |
| Databáze: | OpenAIRE |
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