Abstract
Materials based on a combination of cerium–tungsten−titanium are potentially durable catalysts for selective catalytic NOx reduction using NH3 (NH3–SCR). Flame-spray synthesis is used here to produce WO3/CeOx-TiO2 nanoparticles, which are characterized with respect to their phase composition, morphology, and acidic properties and are evaluated by NH3–SCR. HR-TEM and XRD revealed that flame-made WO3/CeOx-TiO2 consists of mainly rutile TiO2, brannerite CeTi2O6, cubic CeO2, and a minor fraction of anatase TiO2. These phases coexist with a large portion of amorphous mixed Ce–Ti phase. The lack of crystallinity and the presence of brannerite together with the evident high fraction of Ce3+ are taken as evidence that cerium is also present as a dopant in TiO2 and is well dispersed on the surface of the nanoparticles. Clusters of amorphous WO3 homogeneously cover all particles as observed by STEM. Such morphology and phase composition guarantee short-range Ce–O–Ti and Ce–O–W interactions and thus the high surface...
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