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Effect of acidic components (SO42- and WO3) on the surface acidity, redox ability and NH3-SCR activity of new CeO2-TiO2 nanoporous aerogel catalysts: A comparative study

Abstract : Selective catalytic reduction (SCR) of nitrogen oxide (NO) by ammonia (NH 3) was studied in this work over new sulfate (SO 4 2-) or tungsta (WO 3) modified CeO 2-TiO 2 aerogel catalysts. The catalytic systems were elaborated via sol gel method then characterized by: XRD, N 2-Physisorption at 77 K, DRUV-vis, NH 3-TPD and H 2-TPR. It was revealed that the nature of acidic components influences differently the texture, surface oxygen concentration, acidity, reducibility and NH 3-SCR activity of new Ce-based catalysts. Hence, the incorporation of sulfate modifies the nature of Ce species, improves their dispersion through the Ce-SO 4 2interactions and, particularly, generates new strong acid sites which display superior catalytic performance at high temperature NO reduction (NO conversion into N 2 > 90 % between 450 and 500 °C over CeO 2-TiO 2-SO 4 2catalyst). However, the addition of tungsta affects slightly the surface acidity of CeO 2-TiO 2 catalyst but it induces the creation of more reactive surface oxygen and new redox sites at its surface (mainly due to the existence of W-Ce interactions) leading to highly active WO 3-CeO 2-TiO 2 system for the low temperature NH 3-SCR reaction with above 90 % NO conversion into N 2 between 320 and 400 °C.
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https://hal.archives-ouvertes.fr/hal-03648994
Contributor : Gérard Delahay Connect in order to contact the contributor
Submitted on : Friday, April 22, 2022 - 10:24:27 AM
Last modification on : Saturday, April 23, 2022 - 3:34:10 AM

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Jihene Arfaoui, Abdelhamid Ghorbel, Carolina Petitto, Gérard Delahay. Effect of acidic components (SO42- and WO3) on the surface acidity, redox ability and NH3-SCR activity of new CeO2-TiO2 nanoporous aerogel catalysts: A comparative study. Inorganic Chemistry Communications, Elsevier, 2022, 140, pp.109494. ⟨10.1016/j.inoche.2022.109494⟩. ⟨hal-03648994⟩

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