EPR evidence for ruthenium variable valence states in active oxidative catalysts

Kiwi, J.; Prins, R.

doi:10.1016/s0009-2614(86)80177-4

Cited by 7 publications

(2 citation statements)

References 17 publications

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“…However, in the Ru(OH) x /TiO 2 material with 40 wt% Ru, ruthenium(III) was also identified, thus suggesting that both oxidation states were present in the ruthenium oxide, i.e. RuO 2 ÁRu 2 O 3 , with RuO 2 as the major component and Ru(III) oxide in trace amount [24].…”

Section: Resultsmentioning

confidence: 99%

Effect of Support in Heterogeneous Ruthenium Catalysts Used for the Selective Aerobic Oxidation of HMF in Water

2011

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Heterogeneous ruthenium-based catalysts were applied in the selective, aerobic oxidation of 5-hydroxymethylfurfural, a versatile biomass-derived chemical, to form 2,5-furandicarboxylic acid. The oxidation reactions were performed in water with dioxygen as the oxidant at different pressures without added base. Catalysts were prepared by depositing catalytically active Ru(OH) x species on a number of different supports, such as titanium-, aluminum-, cerium-, zirconium-, magnesium-and lanthanum oxides, magnetite, spinel, hydrotalcite and hydroxyapatite. All the catalysts were found to be active in the oxidation reactions, and the choice of support was demonstrated to be important for the catalytic performance.

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Section: Resultsmentioning

confidence: 99%

Effect of Support in Heterogeneous Ruthenium Catalysts Used for the Selective Aerobic Oxidation of HMF in Water

2011

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“…The reasons why no ESR signals of Ru 4+ are observed are explained in terms of a strong zero-field splitting and/or a strong relaxation because of the strong coupling between spin and orbital momentum [19]. The ESR-signals in Fig.…”

Section: Esr Spectra Of Supported Ruo 2 Catalystsmentioning

confidence: 93%

Reactivity of RuO species in RuO/CeO catalysts prepared by a wet reduction method

Hosokawa

Fujinami

Kanai

2005

Journal of Molecular Catalysis A: Chemical

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Quantitative observation of enhanced Ru3+ EPR signals by Nb5+ doping under oxidizing conditions

Kiwi

Suss

1988

Chemical Physics Letters

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EPR evidence for ruthenium variable valence states in active oxidative catalysts

Abstract: Experimental proof is provided by EPR for the presence of Ru 3+ ions in a RuOJTiO, highly dispersed catalyst. A model is proposed for the mode of intervention of Ru3+/Ru4+ states in oxidative processes.

Cited by 7 publications

References 17 publications

Effect of Support in Heterogeneous Ruthenium Catalysts Used for the Selective Aerobic Oxidation of HMF in Water

Effect of Support in Heterogeneous Ruthenium Catalysts Used for the Selective Aerobic Oxidation of HMF in Water

Reactivity of RuO species in RuO/CeO catalysts prepared by a wet reduction method

Quantitative observation of enhanced Ru3+ EPR signals by Nb5+ doping under oxidizing conditions

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