Understanding the growth of RuO2 colloidal nanoparticles over a solid support: An atomic force microscopy study

Fernández, Camila; Pezzotta, Chiara; Raj, Gijo; Gaigneaux, Éric M.; Ruíz, Patricio

doi:10.1016/j.cattod.2015.06.026

Cited by 6 publications

(4 citation statements)

References 27 publications

(40 reference statements)

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“…It is noted that after the reduction treatment of the 5Ru/CeO 2 NC and 5Ru/CeO 2 NO samples, there is an increase of the BET surface area, possibly as a result of redispersion of RuO x species on the CeO 2 . Fernández et al found a decreased crystallites mean size and disaggregation of large nanorod-like RuO 2 structures to small round-shaped Ru crystallites during a reduction treatment for γ-Al 2 O 3 -supported RuO 2 particles. However, the BET surface areas (108.4 m 2 /g for the oxidized sample and 107.4 m 2 /g for the reduced sample) of 5Ru/CeO 2 NR are almost the same as those with CeO 2 NR support (105.5 m 2 /g), indicating the high dispersion and thermal stability of CeO 2 NR-supported Ru species.…”

Section: Results and Discussionmentioning

confidence: 99%

Distribution and Valence State of Ru Species on CeO₂ Supports: Support Shape Effect and Its Influence on CO Oxidation

et al. 2019

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In this work, ruthenium (Ru) catalysts supported on CeO2 nanorods (NR), nanocubes (NC), and nanoctahedra (NO) were comparatively investigated to correlate the shape and exposed surface planes ({100}, {110}, and {111}) of nanoscale CeO2 supports with their low-temperature CO oxidation activity. Within the 5Ru/CeO2-r catalysts with three morphologies after reduction treatment, the Ru supported on CeO2 NR exhibited enhanced low-temperature (<100 °C) hydrogen consumption and superior room-temperature CO oxidation activity (∼9% CO conversion). Both X-ray photoelectron spectroscopy and X-ray absorption spectroscopy measurements revealed that Ru n+ homogeneously predominates the 5Ru/CeO2NR-r, which is very different from partial metallic Ru0 supported on CeO2 NC and NO, indicating the strong metal–support interaction formation between Ru and CeO2 NR by Ru ions diffusing into CeO2 surface lattice or forming Ru–O–Ce bonds at the interface. The enriched surface defects on the exposed {111} planes of CeO2 NR support are believed to be the key to the formation of cationic Ru species, which is of vital importance for the superior room-temperature CO oxidation activity of the 5Ru/CeO2NR-r catalyst. The higher surface oxygen vacancy concentration on 5Ru/CeO2NR-r than those on the CeO2 NC and NO is also crucial for adsorption/dissociation of oxygen in achieving low-temperature CO oxidation activity.

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Section: Results and Discussionmentioning

confidence: 99%

Distribution and Valence State of Ru Species on CeO₂ Supports: Support Shape Effect and Its Influence on CO Oxidation

et al. 2019

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“…This is due to the redispersion of partially reduced RuO x species over CeO 2 supports. For example, Fernández et al 44 reported the disaggregation and transformation of large RuO 2 to small round shape Ru crystallites after reduction treatment. The H 2 -TPR profiles of the reduced sample are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Non-equilibrium plasma-assisted dry reforming of methane over shape-controlled CeO₂ supported ruthenium catalysts

et al. 2023

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“…On the other hand, the same extent of decrease of the average particle size (ca. 20 nm) associated with the reduction of RuO 2 to Ru was recently found by Fernández et al . with RuO 2 ‐based catalysts supported on γ‐alumina.…”

Section: Resultsmentioning

confidence: 99%

“…with RuO 2 ‐based catalysts supported on γ‐alumina. The disaggregation of such particles occurring during the reduction treatment was observed by using different complementary techniques such as XRD, TEM, atomic force microscopy (AFM) and X‐ray photoelectron spectrocopy (XPS) …”

Section: Resultsmentioning

confidence: 99%

A Sol–Gel Ruthenium–Niobium–Silicon Mixed‐Oxide Bifunctional Catalyst for the Hydrogenation of Levulinic Acid in the Aqueous Phase

et al. 2017

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A mixed-oxide nanomaterial with composition (RuO2)0.038(Nb2O5)0.024(SiO2)0.938 was prepared by a one-pot sol–gel route. The synthesis was entirely performed at room temperature, by using easy-to-handle precursors and avoiding the employment of any toxic and/or polluting reactant. One of the samples was synthesised in the presence of a non-ionic surfactant acting as both pore directing agent and metal complexing agent, obtaining a high-specific-surface-area material characterized by a very good dispersion of the metallic species. In both cases, nanomaterials characterized by a complete reducibility of Ru species were obtained. The reduced nanomaterials acted as effective bifunctional catalysts in the hydrogenation of levulinic acid (LA) to γ-valerolactone, performed under mild conditions in the aqueous phase. The catalyst prepared without surfactant showed good stability and no activity loss during all the performed cycles. By contrast, some deactivation phenomena took place with the surfactant-templated catalyst. These phenomena were ascribed to both the partial surface oxidation and the surface adsorption of LA molecules giving deactivation during the second run

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Understanding the growth of RuO2 colloidal nanoparticles over a solid support: An atomic force microscopy study

Cited by 6 publications

References 27 publications

Distribution and Valence State of Ru Species on CeO₂ Supports: Support Shape Effect and Its Influence on CO Oxidation

Distribution and Valence State of Ru Species on CeO₂ Supports: Support Shape Effect and Its Influence on CO Oxidation

Non-equilibrium plasma-assisted dry reforming of methane over shape-controlled CeO₂ supported ruthenium catalysts

A Sol–Gel Ruthenium–Niobium–Silicon Mixed‐Oxide Bifunctional Catalyst for the Hydrogenation of Levulinic Acid in the Aqueous Phase

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Understanding the growth of RuO2 colloidal nanoparticles over a solid support: An atomic force microscopy study

Cited by 6 publications

References 27 publications

Distribution and Valence State of Ru Species on CeO2 Supports: Support Shape Effect and Its Influence on CO Oxidation

Distribution and Valence State of Ru Species on CeO2 Supports: Support Shape Effect and Its Influence on CO Oxidation

Non-equilibrium plasma-assisted dry reforming of methane over shape-controlled CeO2 supported ruthenium catalysts

A Sol–Gel Ruthenium–Niobium–Silicon Mixed‐Oxide Bifunctional Catalyst for the Hydrogenation of Levulinic Acid in the Aqueous Phase

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Product

Resources

About

Distribution and Valence State of Ru Species on CeO₂ Supports: Support Shape Effect and Its Influence on CO Oxidation

Distribution and Valence State of Ru Species on CeO₂ Supports: Support Shape Effect and Its Influence on CO Oxidation

Non-equilibrium plasma-assisted dry reforming of methane over shape-controlled CeO₂ supported ruthenium catalysts