A new V₂O₅–MoO₃–TiO₂–SO₄²⁻nanostructured aerogel catalyst exhibits superior SCR activity compared to the V₂O₅–WO₃/TiO₂commercial catalyst (EUROCAT) at high temperatures (375–500 °C).

Injectable hydrogels with self-healing properties, tissue adhesion, biocompatibility, and cancer therapeutic capabilities offer a promising solution for addressing bone loss and residual tumor cells following surgical resection of osteosarcoma.

New cerium and/or tungsten modified V₂O₅–TiO₂ aerogel catalysts (V₂O₅–TiO₂,V₂O₅–WO₃–TiO_2, V₂O₅–CeO₂–TiO₂ and V₂O₅–WO₃–CeO₂–TiO₂) were successfully developed, by associating the sol gel procedure and supercritical drying approach. A combination of various analytical techniques, including XRD, N₂-Physisorption at 77 ​K, DRUV-Vis spectroscopy, NH₃-TPD and H₂-TPR, was used to characterize the obtained solids. Their catalytic performances were evaluated in the low temperature NO-SCR by NH₃. The results reveal that all the materials exhibit high cristallinity of TiO₂ anatase phase and developed mesoporous texture. The addition of tungsten (W) increases the surface acidity of V₂O₅–TiO₂ and thereby enhances its reactivity at high temperatures (>420 ​°C). However, the addition of cerium (Ce) improves the redox properties of the latter catalyst and increases significantly its NO-SCR reactivity, especially at low temperatures. The NO-SCR activity increases over the aerogel systems, in the 200–400 ​°C temperature range, following this order: V₂O₅–WO₃–TiO₂ ​< ​V₂O₅–TiO₂ ​< ​V₂O₅–CeO₂–TiO₂ ​< ​V₂O₅–WO₃–CeO₂–TiO₂. The new V₂O₅–WO₃–CeO₂–TiO₂ system was found to be the most active catalyst for converting NO into N₂ (with 60% and 90% NO conversions at 250 ​°C and between 320 and 420 ​°C, respectively). The highest SCR activity of this new aerogel solid if compared to the other samples was essentially correlated with a good reactivity of its acidic and redox sites which in turn was related to the existence of strong interactions between cerium and the other active elements (mostly Ce↔ V and Ce ↔ W).