Surface-dependent oxidation of H 2 on CeO 2 surfaces

Désaunay, Thomas; Bonura, Giuseppe; Chiodo, V.; Freni, S.; Couzinié, Jean-Philippe; Bourgon, Julie; Ringuedé, Armelle; Labat, Frédèric; Adamo, Carlo; Cassir, M.

doi:10.1016/j.jcat.2012.10.011

Cited by 115 publications

(101 citation statements)

References 33 publications

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“…The order of the catalytic activity: cubes [ rods * particles (Fig. 5b) is moreover consistent with the results reported for oxidation of hydrogen and ethanol over pure and supported ceria nanoshapes [36,37]. Fundamental studies in addition revealed higher inherent reactivity of (100) crystal planes of ceria for methanol [65], water [66], acetaldehyde [67] and acetic acid [68] compared to (111) facets, though under very different conditions compared to realistic reaction conditions.…”

Section: Discussionsupporting

confidence: 86%

“…Ceria nanocubes on the other hand displayed greater activity compared to nanoparticles of irregular morphology in selective oxidation of toluene and benzene oxidation [35]. Pure and supported ceria nanocubes exhibited twice higher activity in oxidation of hydrogen and ethanol compared to rods and particles [36,37]. Similar trends were reported by our group in WGS and ethylbenzene dehydrogenation [18,38].…”

Section: Introductionsupporting

confidence: 85%

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Effects of Morphology of Cerium Oxide Catalysts for Reverse Water Gas Shift Reaction

et al. 2016

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Reverse water gas shift reaction (RWGS) was investigated over cerium oxide catalysts of distinct morphologies: cubes, rods and particles. Catalysts were characterized by X-ray diffraction, Raman spectroscopy and temperature programmed reduction (TPR) in hydrogen. Nanoshapes with high concentration of oxygen vacancies contain less surface oxygen removable in TPR. Cerium oxide cubes exhibited two times higher activity per surface area as compared to rods and particles. Catalytic activity of these nanoshapes in RWGS reaction exhibited a relation with the lattice microstrain increase, however a causal relationship remained unclear. Results presented in this study suggest that superior catalytic activity of ceria cubes in RWGS originates from the greater inherent reactivity of (100) crystal planes enclosing cubes, contrary to less inherently reactive (111) facets exposed at rods and particles.Graphical Abstract

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Section: Discussionsupporting

confidence: 86%

Section: Introductionsupporting

confidence: 85%

Effects of Morphology of Cerium Oxide Catalysts for Reverse Water Gas Shift Reaction

et al. 2016

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“…Two types of shape-controlled nanoceria supports (nanocubes and nanorods) were prepared according to previously reported methodologies [18,[29][30][31]. For ceria nanocubes (CeO 2 -C) a NaOH solution (57.60 g NaOH dissolved in 210 mL of distilled water) was added dropwise into a Ce(NO 3 ) 3 ·6H 2 O solution (5.21 g of Ce(NO 3 ) 3 ·6H 2 O in 30 mL of distilled water) under vigorous stirring.…”

Section: Catalyst Preparationmentioning

confidence: 99%

The influence of nano-architectured CeO supports in RhPd/CeO2 for the catalytic ethanol steam reforming reaction

Divins

Casanovas

et al. 2015

Catalysis Today

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a b s t r a c tThe ethanol steam reforming (ESR) reaction has been tested over RhPd supported on polycrystalline ceria in comparison to structured supports composed of nanoshaped CeO2 cubes and CeO2 rods tailored toward the production of hydrogen. At 650-700 K the hydrogen yield follows the trend RhPd/CeO2 -cubes > RhPd/CeO2 -rods > RhPd/CeO2 -polycrystalline, whereas at temperatures higher than 800 K the catalytic performance of all samples is similar and close to the thermodynamic equilibrium. The improved performance of RhPd/CeO2 -cubes and RhPd/CeO2 -rods for ESR at low temperature is mainly ascribed to higher water-gas shift activity and a strong interaction between the bimetallic-oxide support interaction. STEM analysis shows the existence of RhPd alloyed nanoparticles in all samples, with no apparent relationship between ESR performance and RhPd particle size. X-ray diffraction under operating conditions shows metal reorganization on {1 0 0} and {1 1 0} ceria crystallographic planes during catalyst activation and ESR, but not on {1 1 1} ceria crystallographic planes. The RhPd reconstructing and tuned activation over ceria nanocubes and nanorods is considered the main reason for better catalytic activity with respect to conventional catalysts based on polycrystalline ceria.

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“…The controlled morphology generates well-defined exposed crystallographic planes, which may lead to improved catalytic activity. Ceria particles with fluorite structure (Figure 1) preferentially expose stable (111) planes [70,71]. However, by reducing the particle size of ceria to nanodimensions, contributions from the less stable (110) and (100) terminations are reported [6,9,38].…”

Section: Recent Work On the Structure And Reactivity Of Ceria Nanoshapesmentioning

confidence: 99%

Ceria Nanoshapes—Structural and Catalytic Properties

Agarwal

Mojet

Lefferts

et al. 2015

Catalysis by Materials With Well-Defined Structures

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Surface-dependent oxidation of H 2 on CeO 2 surfaces

Cited by 115 publications

References 33 publications

Effects of Morphology of Cerium Oxide Catalysts for Reverse Water Gas Shift Reaction

Effects of Morphology of Cerium Oxide Catalysts for Reverse Water Gas Shift Reaction

The influence of nano-architectured CeO supports in RhPd/CeO2 for the catalytic ethanol steam reforming reaction

Ceria Nanoshapes—Structural and Catalytic Properties

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