Promotional effect of ceria on the catalytic behaviour of new V2O5–WO3–TiO2 aerogel solids for the DeNOx process

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