Effect of alkali addition on a Cu/SmCeO<sub>2</sub> @TiO<sub>2</sub> catalyst for NO reduction with CO under oxidizing conditions

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dc.coverageDOI: 10.1016/j.cattod.2023.114247
dc.creatorLópez, Naima
dc.creatorMonte, Manuel
dc.creatorIglesias-Juez, Ana
dc.creatorPortela, Raquel
dc.creatorXuyun, Guo
dc.creatorYe, Zhu
dc.creatorAguila, Gonzalo
dc.creatorAraya, Paulo
dc.creatorGuerrero, Sichem
dc.date2023
dc.date.accessioned2026-01-05T21:05:28Z
dc.date.available2026-01-05T21:05:28Z
dc.description<p>The accumulation of alkali metals generated during biomass combustion onto the catalysts employed for off-gas treatment can have a detrimental effect on their performance. This work investigates the effect of potassium as a model alkali on an efficient copper-based catalyst supported on SmCeO<sub>2</sub> @TiO<sub>2</sub>. The addition of potassium modifies the redox properties of the Cu species or, more specifically, the metal-ceria interface, providing better catalytic activity for NO reduction in oxidizing conditions. SmCeO<sub>2</sub> @TiO<sub>2</sub> stabilizes highly dispersed copper species, and the presence of potassium introduces surface distortions that modify the lability of oxygen atoms. The results demonstrate the key role of surface defects and labile oxygen species associated with the CeO<sub>2</sub> support. It was found that both Cu/SmCeO<sub>2</sub> @TiO<sub>2</sub> and K/Cu/SmCeO<sub>2</sub> @TiO<sub>2</sub> catalysts fully oxidized CO below 350 °C and actively reduced NO with CO in the presence of excess oxygen, reaching a maximum NO conversion of 65% at 316 °C and 83% at 330 °C, respectively, while undesired NO<sub>2</sub> release was minimized in the alkaline-loaded sample.</p>eng
dc.identifierhttps://investigadores.uandes.cl/en/publications/69d9fd2d-38f7-415f-b8b9-474407a89355
dc.identifier.urihttps://repositorio.uandes.cl/handle/uandes/61972
dc.languageeng
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.sourcevol.423 (2023) date: 2023-11-01 p.1-15
dc.subjectCeO @TiO
dc.subjectCopper-ceria interface
dc.subjectNO selective reduction
dc.subjectPotassium
dc.titleEffect of alkali addition on a Cu/SmCeO<sub>2</sub> @TiO<sub>2</sub> catalyst for NO reduction with CO under oxidizing conditionseng
dc.typeArticleeng
dc.typeArtículospa
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