Vanadium-51 NMR

Howarth, Oliver W.

doi:10.1016/0079-6565(90)80007-5

Cited by 106 publications

(73 citation statements)

References 134 publications

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“…In this study, we modified SiO 2 -supported Rh particles (Rh/SiO 2 ) with several α-Keggin-type silicovanadotungstates under strongly reductive conditions. Rh/SiO 2 was selected because metal-oxide-derived Rh/SiO 2 is a typical hydrodeoxygenation catalyst, ,− and α-Keggin-type silicovanadotungstates are selected as modifier POMs because they are stable and easily observable by 51 V NMR . Although a part of POM is irreversibly decomposed to form an Rh–W alloy on the surface, we found that α-SiVW 11 O 40 5– can be adsorbed as a reduced form on Rh(−W)/SiO 2 particles at 433 K under 1 MPa H 2 , and the adsorbed POM can be desorbed by oxidation without change of the POM structure.…”

Section: Introductionsupporting

confidence: 68%

Adsorption of Keggin-Type Polyoxometalates on Rh Metal Particles under Reductive Conditions

et al. 2021

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The adsorption of POMs on Rh/SiO 2 in water solvent under strongly reductive conditions was investigated. Aqueous solutions of α-Keggin type silicotungstate and silicovanadotungstates were mixed with Rh/SiO 2 at 393−473 K under 1 MPa of H 2 . Monovanadium-substituted silicotungstate, α-SiVW 11 O 40 5− (SiVW 11 ), was more readily adsorbed than nonsubstituted silicotungstate, α-SiW 12 O 40 4− (SiW 12 ). After adsorption at 433 K, SiVW 11 was desorbed from Rh/SiO 2 by oxidation with Br 2 water without change of the Keggin structure, as evidenced by 51 V NMR. Trivanadium-substituted silicotungstate, α-1,2,3-SiV 3 W 9 O 40 7− , was not stable, and the desorbed species from Rh/SiO 2 by oxidation with Br 2 did not maintain the Keggin structure. The very high temperature for adsorption (473 K) also led to the decomposition of the Keggin structure of SiVW 11 . An increase in the concentration of SiVW 11 in the liquid phase gave a saturation of the amount of desorbable SiVW 11 , up to five SiVW 11 anions per one Rh particle with a 3 nm size. The elemental analysis and W L 3 -edge extended X-ray absorption fine structure of Rh/SiO 2 after the adsorption of SiVW 11 showed that a part of SiVW 11 was decomposed and irreversibly adsorbed as metallic W species incorporated into the surface of Rh metal particles. The amount of decomposed SiVW 11 was almost the same as that of SiVW 11 adsorbed as the original Keggin structure. The desorbable SiVW 11 was probably bonded on the W atom incorporated on the Rh metal particles as the two-electron-reduced form (α-SiV III W 11 O 40 7− ).

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Section: Introductionsupporting

confidence: 68%

Adsorption of Keggin-Type Polyoxometalates on Rh Metal Particles under Reductive Conditions

et al. 2021

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“…S11 † ). 35 The observation of V V -Oxo species in the VCl 3 promoted NO 3 − reduction reaction indisputably illustrates that the VCl 3 sponsored NO 3 − to NO conversion should proceed via the two consecutive OAT reactions, where OAT-1 mimics the NRs enzymatic reaction, 5 b ,36 while OAT-2 mimics the phosphorus or sulphur induced OAT transfer reactions ( Schemes 1 and 2 ). 26,31 …”

Section: Resultsmentioning

confidence: 99%

Oxygen atom transfer promoted nitrate to nitric oxide transformation: a step-wise reduction of nitrate → nitrite → nitric oxide

et al. 2021

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“…Ž . For these complexes, as for vanadium V species in general, 51 V-NMR spectroscopy 12 has proven to be an invaluable analytical tool. 13 With the breakthrough in chemical-shift computations based on Ž .…”

Section: Introduction Ven Though Vanadium Plays An Importantmentioning

confidence: 99%

Theoretical study of a vanadate peptide complex

Bühl

1999

J. Comput. Chem.

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Vanadium-51 NMR

Cited by 106 publications

References 134 publications

Adsorption of Keggin-Type Polyoxometalates on Rh Metal Particles under Reductive Conditions

Adsorption of Keggin-Type Polyoxometalates on Rh Metal Particles under Reductive Conditions

Oxygen atom transfer promoted nitrate to nitric oxide transformation: a step-wise reduction of nitrate → nitrite → nitric oxide

Theoretical study of a vanadate peptide complex

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