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New CeO2–TiO2, WO3–TiO2 and WO3–CeO2–TiO2 mesoporous aerogel catalysts for the low temperature selective catalytic reduction of NO by NH3

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Abstract

New mesoporous and well-structured aerogel catalysts (CeO2–TiO2, WO3–TiO2 and WO3–CeO2–TiO2) were elaborated via the sol–gel method, characterized by means of various techniques (XRD; N2-Physisorption at 77 K; NH3-TPD; H2-TPR; DRUV–Vis spectroscopy) and evaluated in the selective catalytic reduction (SCR) of NO by NH3. The results reveal that all the aerogel catalysts develop essentially the diffraction peaks of TiO2 anatase phase and are classified as mesoporous materials with a high surface area (70 < SBET < 106 m2 g−1), large porosity (0.27 < VPT < 0.46 cm3 g−1) and nanometer size of crystallites (8–15 nm). The addition of Ce and/or W influences differently the structure, texture, crystallites size, surface oxygen concentration, total acidity and redox ability of aerogel samples and clearly affects their NO-SCR activity which follows this order: TiO2 < WO3–TiO2 < CeO2–TiO2 < WO3–CeO2–TiO2. It was also found that cerium species are more active in the low temperature NO-SCR reaction than tungsten ones (NO conversions obtained at 300 °C using CeO2–TiO2 and WO3–TiO2 were 75 and 0%, respectively). On the other hand, it was suggested that the interactions between Ce and W species play a key role in improving the reactivity of WO3–CeO2–TiO2 catalyst in the SCR of NO by NH3. Interestingly, the NO conversion into N2 reaches 85% at 300 °C and exceeds 90% between 320 and 400 °C over this novel meso-structured aerogel catalyst.

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Acknowledgements

The authors wish to express their sincere thanks to Thomas Cacciaguerra for XRD analysis. Laboratory of Chemistry of Materials and Catalysis (LCMC) of Tunisia and FrancoTunisian Cooperation (French Institute of Tunisia, SSHN Grant) are gratefully acknowledged for the financial support.

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  1. Laboratoire de Chimie des Matériaux et Catalyse, Département de Chimie, Faculté des Sciences de Tunis, Université Tunis El Manar, Campus Universitaire Farhat Hached d’El Manar, 2092, Tunis, Tunisia

    Jihene Arfaoui & Abdelhamid Ghorbel

  2. ICGM, Univ Montpellier, ENSCM (MACS), CNRS, Montpellier, France

    Carolina Petitto & Gerard Delahay

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  1. Jihene Arfaoui
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  2. Abdelhamid Ghorbel
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  3. Carolina Petitto
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Arfaoui, J., Ghorbel, A., Petitto, C. et al. New CeO2–TiO2, WO3–TiO2 and WO3–CeO2–TiO2 mesoporous aerogel catalysts for the low temperature selective catalytic reduction of NO by NH3. J Porous Mater 28, 1535–1543 (2021). https://doi.org/10.1007/s10934-021-01102-3

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