CO preferential oxidation reaction aspects in a nanocrystalline CuO/CeO2 catalyst

Reis, Cristhiane Guimarães Maciel; Almeida, Karina Arruda; Silva, T.F.; Assaf, José Mansur

doi:10.1016/j.cattod.2018.10.037

Cited by 15 publications

(3 citation statements)

References 32 publications

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“…The loss of activity in the presence of water vapor is common for transition-metal COPROX catalysts, but it is notable that, with the aerogel-expressed catalysts, we observe an operational temperature window that retains high activity ( T 50 ) and selectivity (see eq ). To the best of our knowledge, these architected COPROX catalysts are the first to demonstrate >95% CO conversion and >95% selectivity toward CO 2 under humid conditions. ,,,− …”

Section: Resultsmentioning

confidence: 99%

Cu/CeO₂ and Cu/Gd-Substituted CeO₂ Aerogels as Active, Selective, and Stable COPROX Catalysts

Novak

DeSario

Brintlinger

et al. 2023

ACS Sustainable Chem. Eng.

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Purifying hydrogen feedstocks necessitates preferential oxidation of carbon monoxide (COPROX), but traditional precious metal catalysts are poorly selective, while transition metal catalysts suffer from insufficient activity and stability. We report that Cu nanoparticles supported on CeO 2 or Gd(III)-substituted CeO 2 (GCO) aerogels deliver a rare combination of high activity, selectivity, and stability for COPROX. The reducing oxide disperses Cu and stabilizes its more active low-valent state. Aerogel-supported Cu oxidizes CO at low temperature but requires higher temperatures to oxidize H 2 and, therefore, shows wide temperature ranges with >95% CO conversion and >95% selectivity vs H 2 . This performance is maintained for >16 h of continuous operation in dry or humidified reaction streams. The Cu/GCO aerogel is less active than Cu/CeO 2 under dry feedstreams but experiences less loss of activity under humid conditions because the higher surface area of the former distributes surface-adsorbed water along the network and reacts it at oxygen vacancies. Aerogel-based architected catalysts offer an effective design route to achieve high and stable catalytic activity under industrially relevant conditions.

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Section: Resultsmentioning

confidence: 99%

Cu/CeO₂ and Cu/Gd-Substituted CeO₂ Aerogels as Active, Selective, and Stable COPROX Catalysts

Novak

DeSario

Brintlinger

et al. 2023

ACS Sustainable Chem. Eng.

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“…Likewise, the CuO-CeO2 system has also been widely studied by several authors and the results obtained in COPrOx are comparable to those reached by noble catalysts on a great number of occasions. In this sense, the CuO/CeO2 system performance depends of the diverse factors, such as the preparation methods, the concentrations of actives phases, the promoters, etc., since this influence in the physicochemical properties affecting the Cu + /Cu 2+ and Ce 3+ /Ce 4+ redox couples [17][18][19][20][21][22][23]. The relative high reactivity of CuO-CeO2 catalysts towards CO rather than H2 oxidation is attributed to the synergistic copper-ceria interactions on the interface.…”

Section: Introductionmentioning

confidence: 99%

CuO-CeO2 catalysts based on SBA-15 and SBA-16 for COPrOx. Influence of oxides concentration, incorporation method and support structure

et al. 2022

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“…Thus, nanosized CeO 2 with high surface area or surface defect supported CuO catalysts display superior activity for CO-PROX in comparison with usually used CuO/CeO 2 catalysts. Reis et al [13] reported that CuO/CeO 2 -nanocrystalline catalysts (S BET = 92 m 2 •g −1 ) with copper loading of 1.0 wt.% exhibited an improved reactivity for CO-PROX reaction. The high activity was closely related to the finely dispersed CuO species strongly interacting with CeO 2 nanocrystalline.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Activity for CO Preferential Oxidation over CuO Catalysts Supported on Nanosized CeO2 with High Surface Area and Defects

et al. 2021

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Nanosizedceria (n-CeO2) was synthesized by a facile method in 2-methylimidazolesolution. The characterization results of XRD, N2 adsorption-desorption, Raman and TEM indicate that n-CeO2 shows a regular size of 10 ± 1 nm, a high surface area of 130 m2·g−1 and oxygen vacancies on the surface. A series of CuO/n-CeO2 catalysts (CuCeOX) with different copper loading were prepared for the preferential oxidation of CO in H2-rich gases (CO-PROX). All CuCeOX catalysts exhibit a high catalytic activity due to the excellent structural properties of n-CeO2, over which the 100% conversion of CO is obtained at 120 °C. The catalytic activity of CuCeOX catalysts increases in the order of CuCeO12 < CuCeO3 < CuCeO6 < CuCeO9. It is in good agreement with the order of the amount of active Cu+ species, Ce3+ species and oxygen vacancies on these catalysts, suggesting that the strength of interaction between highly dispersed CuO species and n-CeO2 is the decisive factor for the activity. The stronger interaction results in the formation of more readily reducible copper species on CuCeO9, which shows the highest activity with high stability and the broadest temperature “window” for complete CO conversion (120–180 °C).

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CO preferential oxidation reaction aspects in a nanocrystalline CuO/CeO2 catalyst

Cited by 15 publications

References 32 publications

Cu/CeO₂ and Cu/Gd-Substituted CeO₂ Aerogels as Active, Selective, and Stable COPROX Catalysts

Cu/CeO₂ and Cu/Gd-Substituted CeO₂ Aerogels as Active, Selective, and Stable COPROX Catalysts

CuO-CeO2 catalysts based on SBA-15 and SBA-16 for COPrOx. Influence of oxides concentration, incorporation method and support structure

Enhanced Activity for CO Preferential Oxidation over CuO Catalysts Supported on Nanosized CeO2 with High Surface Area and Defects

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CO preferential oxidation reaction aspects in a nanocrystalline CuO/CeO2 catalyst

Cited by 15 publications

References 32 publications

Cu/CeO2 and Cu/Gd-Substituted CeO2 Aerogels as Active, Selective, and Stable COPROX Catalysts

Cu/CeO2 and Cu/Gd-Substituted CeO2 Aerogels as Active, Selective, and Stable COPROX Catalysts

CuO-CeO2 catalysts based on SBA-15 and SBA-16 for COPrOx. Influence of oxides concentration, incorporation method and support structure

Enhanced Activity for CO Preferential Oxidation over CuO Catalysts Supported on Nanosized CeO2 with High Surface Area and Defects

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Product

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Cu/CeO₂ and Cu/Gd-Substituted CeO₂ Aerogels as Active, Selective, and Stable COPROX Catalysts

Cu/CeO₂ and Cu/Gd-Substituted CeO₂ Aerogels as Active, Selective, and Stable COPROX Catalysts