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Designing CuO–SiO2 and Cu0–SiO2 Monolithic Ceramics Bearing Hierarchical Porosity Toward Robust and Cycling CO Oxidation Properties

hal.structure.identifierCentre de Recherche Paul Pascal [CRPP]
dc.contributor.authorVARDON, Antoine
hal.structure.identifierCentre de Recherche Paul Pascal [CRPP]
dc.contributor.authorLABARRÈRE, Hugo
hal.structure.identifierCentre de Recherche Paul Pascal [CRPP]
dc.contributor.authorNALLET, Frédéric
hal.structure.identifierDepartment of Civil and Environmental Engineering [Cambridge] [CEE]
dc.contributor.authorCHANUT, Nicolas
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorWEILL, François
hal.structure.identifierPlateforme Aquitaine de Caractérisation des Matériaux [PLACAMAT]
dc.contributor.authorLABRUGÈRE-SARROSTE, Christine
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorBOBET, Jean-Louis
hal.structure.identifierCentre de Recherche Paul Pascal [CRPP]
dc.contributor.authorLY, Isabelle
hal.structure.identifierInstitut de chimie des milieux et matériaux de Poitiers [UMR 7285] [IC2MP [Poitiers]]
dc.contributor.authorEPRON, Florence
hal.structure.identifierInstitut de chimie des milieux et matériaux de Poitiers [UMR 7285] [IC2MP [Poitiers]]
dc.contributor.authorESPECEL, Catherine
hal.structure.identifierCentre de Recherche Paul Pascal [CRPP]
dc.contributor.authorBACKOV, Rénal
dc.date.issued2023
dc.identifier.issn0897-4756
dc.description.abstractEnIn the general context of environmental air remediation, copper-oxide-based self-standing porous catalysts (MUB-103(x)) and their reduced homologues (Red MUB-103(x)) have been synthesized and studied for the thermoconversion of CO to CO2. Catalytic experiments under dry air conditions reveal that for nonreduced catalysts, increasing the Cu content diminishes the light-off temperature T50 (corresponding to 50% conversion). The catalytic performances exhibited by the CuO phase dispersed in the silica pores of MUB-103(x) samples are the highest reached to date despite the limitations of the experimental conditions used. After reduction with H2, the native Red MUB-103(x) catalysts offer CO conversion efficiencies significantly more increased, leading to a lowering of the T50 values equal to at least 100°C. As such, the CO conversion reaches a T50 value of 160 °C for Red MUB-103(2) with 1.81 wt % Cu; this catalyst displays a specific rate of 8.6 mmolCO gCu–1 s–1 at 175 °C, largely higher than those observed to date. The performances of the Red MUB-103(2) sample were evaluated for CO oxidation under humid conditions with the addition of 5 vol % water vapor in the feed during four cycles, leading to the same efficiency when compared with that under dry experimental conditions, revealing robustness. A drastic increase in the CO conversion temperature was observed for the 4th cycle, i.e., after 8 h under humid conditions. Analyses of the spent Red MUB-103(2) catalyst after four cycles reveal a slight oxidation of copper, leading to Cu2O species. Importantly, after four cycles, the deactivated catalyst was able to partially recover its performance when reactivated through a 2 h reducing treatment under H2 at 400 °C.
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.title.enDesigning CuO–SiO2 and Cu0–SiO2 Monolithic Ceramics Bearing Hierarchical Porosity Toward Robust and Cycling CO Oxidation Properties
dc.typeArticle de revue
dc.identifier.doi10.1021/acs.chemmater.2c03022
dc.subject.halChimie/Matériaux
bordeaux.journalChemistry of Materials
bordeaux.page228–241
bordeaux.volume35
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-03927115
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03927115v1
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