Ceria Nanoshapes—Structural and Catalytic Properties

Agarwal, Shilpa; Mojet, Barbara; Lefferts, Leon; Datye, Abhaya K.

doi:10.1016/b978-0-12-801217-8.00002-5

Cited by 17 publications

(29 citation statements)

References 153 publications

(330 reference statements)

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“…No shift of the F 2g band was observed in bare ceria upon 16 In particular, it was attributed to reduction of the ceria subsurface under CO/H 2 18 O/Ar at 120 °C and to large amounts of 18 O in the subsurface of the ceria support due to oxygen transfer from the surface to the ceria subsurface highlighting the oxygen dynamics of the ceria support. O, (dark blue), 2% CO (green), and CO oxidation reaction conditions (2% CO, 10% O 2 , brown).…”

Section: Environmental Catalysismentioning

confidence: 89%

“…Apart from its well-established application in three-way catalysis (TWC) [2], ceria is looming as a catalyst component for a wide range of catalytic applications [3] such as soot oxidation [4,5], NH 3 -SCR reactions [6,7], remediation of volatile organic compounds (VOCs) [8], removal of CO 2 , SO 2 and NOx gases [9], hydrogen purification and production processes [10], conversion of CO 2 [11], wet air oxidation [12] reforming of hydrocarbons and so on [1]. The shape and size modification, surface/face reconstruction, and faceting of ceria at the nanoscale level can offer an important tool to govern activity and stability in these reactions [13][14][15][16][17][18]. Furthermore, strong interaction between noble metals and ceria leads to their higher dispersion, electronic modifications and enhanced catalytic activity [19].…”

Section: Introductionmentioning

confidence: 99%

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Raman spectroscopy as a powerful tool to characterize ceria-based catalysts

2021

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A review. CeO 2 is widely used and investigated as an oxide catalyst or support due to its unique redox property of oxygen storage and release. In this paper, the different opportunities offered by Raman spectroscopy for advanced characterization of ceria-based catalysts are reviewed: spectral modifications induced by nanocrystallinity, defects, doping and reduction, identification of supported molecular species, isolated atoms and nanoclusters, characterization of surface modes, hydroxyl groups, reaction intermediates such as peroxo and superoxo species. Finally, in situ/operando studies for environmental catalysis are summarized illustrating Raman spectroscopy as a powerful tool to characterize ceria-based catalysts.

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Section: Environmental Catalysismentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Raman spectroscopy as a powerful tool to characterize ceria-based catalysts

2021

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“…CeO 2 favors the formation of hydroxyl groups even with the first pulse of CO, which could be decisive in ensuring a syngas with a lower CO concentration. In the C-O* zone (1200 to 1700 cm −1 [63]), the formation of bidentate carbonates (1600 cm −1 ) and formates (1300 and 1500 cm −1 ) are observed, which are also intermediates in the CO conversion [20,51,63]. The formation of hydroxyl groups and C-O* species were lower than dual supports when compared to CeO 2 ; specifically, CeO 2 -Al 2 O 3 shows a significant reduction in the formation of C-O* intermediates, which would correspond to its lower activity among the dual supports (Figure 2).…”

Section: In Situ Driftsmentioning

confidence: 99%

Single and Dual Metal Oxides as Promising Supports for Carbon Monoxide Removal from an Actual Syngas: The Crucial Role of Support on the Selectivity of the Au–Cu System

2019

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A catalytic screening was performed to determine the effect of the support on the performance of an Au–Cu based system for the removal of CO from an actual syngas. First, a syngas was obtained from reforming of ethanol. Then, the reformer outlet was connected to a second reactor, where Au–Cu catalysts supported on several single and dual metal oxides (i.e., CeO2, SiO2, ZrO2, Al2O3, La2O3, Fe2O3, CeO2-SiO2, CeO2-ZrO2, and CeO2-Al2O3) were evaluated. AuCu/CeO2 was the most active catalyst due to an elevated oxygen mobility over the surface, promoting CO2 formation from adsorption of C–O* and OH− intermediates on Au0 and CuO species. However, its lower capacity to release the surface oxygen contributes to the generation of stable carbon deposits, which lead to its rapid deactivation. On the other hand, AuCu/CeO2-SiO2 was more stable due to its high surface area and lower formation of formate and carbonate intermediates, mitigating carbon deposits. Therefore, use of dual supports could be a promising strategy to overcome the low stability of AuCu/CeO2. The results of this research are a contribution to integrated production and purification of H2 in a compact system.

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“…Several published reviews summarize known shape-dependent catalytic properties on metal oxides, including cuprite and ceria. [24][25][26][27][28][29][30] In contrast with these reviews, we focus almost exclusively on the main unresolved challenges associated with the synthesis of well-defined Cu 2 O and CeO 2 crystals, and the determination of the corresponding surface structure-catalytic property relationships. We aim to summarize commonalities within various synthetic and catalytic systems, and critically assess common interpretations of experimental observations.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Structure and Catalytic Properties of Faceted Oxide Crystals

et al. 2020

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Bulk metal oxide catalysts are key components of numerous large‐scale industrial processes that possess a high degree of complexity in bulk and surface structure. Such complexity manifests itself in the form of large uncertainties with respect to the nature, density, and efficacy of active sites responsible for catalytic turnovers. Faceted oxide crystals present the prospect of exposing well‐defined oxide surfaces while also being amenable for investigation at realistic pressures and temperatures. Despite the opportunity faceted oxide crystals present for developing more rigorous relationships between atomic‐level structure and catalytic function, their use remains far less prevalent compared to their metallic counterparts. This review, focused on cuprous oxide and cerium oxide crystals, seeks to examine and highlight challenges in controlling and rationalizing metal oxide crystallization, as well as limitations preventing elucidation of the relationships between atomic‐level structures and catalytic properties. We postulate that a clearer understanding of these challenges will encourage researchers to further pursue the study of catalytic properties of faceted oxide crystals, aiding not only an enhanced molecular‐level knowledge of bulk oxide catalysis, but also the development of improved materials for large‐scale catalytic processes.

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Ceria Nanoshapes—Structural and Catalytic Properties

Cited by 17 publications

References 153 publications

Raman spectroscopy as a powerful tool to characterize ceria-based catalysts

Raman spectroscopy as a powerful tool to characterize ceria-based catalysts

Single and Dual Metal Oxides as Promising Supports for Carbon Monoxide Removal from an Actual Syngas: The Crucial Role of Support on the Selectivity of the Au–Cu System

Synthesis, Structure and Catalytic Properties of Faceted Oxide Crystals

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