Correlation between reduction potential of vanadium-containing heteropolyacid (HPA) catalysts and their oxidation activity for cyclohexanol dehydrogenation

Park, Dong Ryul; Kim, Hee‐Soo; Lee, Sangeun; Lee, Joohyung; Song, In Kyu

doi:10.1007/s11144-008-5202-0

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…Efforts have been made by Park et al [24,41] to determine the relationship between reduction potential of HPA and their catalytic activity. They have obtained that the HPAs which have high reduction potentials showed high oxidation yields.…”

Section: Effect Of Phmentioning

confidence: 99%

“…HPAs possess unique properties such as: well-defined structure, ability to accept and release electrons, high proton mobility, and possibility to modify their acid-base and redox properties by changing their chemical composition [22,23]. In addition to their stronger Brö nsted acidity, one of the great advantages of HPAs catalysts is that their catalytic properties can be tuned in a systematic way by replacing protons or by substituting framework transition metal atoms with different metals [24].…”

Section: Introductionmentioning

confidence: 99%

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Phenol photodegradation process assisted with Wells–Dawson heteropolyacids

Balaska

Samar²,

Grid³

2015

Desalination and Water Treatment

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A B S T R A C TThis work aims to investigate the catalytic properties of the heteropolyacids (HPAs) within photocatalytic process. Photocatalytic degradation of phenol in aqueous solution was performed using Wells-Dawson HPAs as catalysts under UV-illuminated condition at 254 nm. The effects of various parameters such as, concentration of catalyst, initial pH, and initial phenol concentration on the performance of photocatalytic process have been investigated to obtain the efficient and durable catalysts and determine the better reaction conditions. The kinetics and the efficiency of phenol degradation were determined by various analytical techniques, such as HPLC and TOC. The results show that the photocatalytic degradation efficiency increases with decreasing pH and the optimum pH is 2 for both catalysts. The photodegradation follows pseudo-first-order kinetics with rate constants k = 8.56 × 10 −2 and 9.94 × 10 −2 min −1 for iron-and vanadium-substituted HPAs, respectively.

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Section: Effect Of Phmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phenol photodegradation process assisted with Wells–Dawson heteropolyacids

Balaska

Samar²,

Grid³

2015

Desalination and Water Treatment

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“…Vanadium derivatives of Wells-Dawson polyoxoanions are efficient in catalyzing the vapor-phase dehydrogenation of cyclohexanol [3], oxidation of tetralin by molecular oxygen [4], direct conversion of light C 1 -C 3 alkanes into the corresponding carboxylic acids [5], and other transformations [6–10]. In all of the above cases vanadium substitution enhances dramatically the catalytic activity of the oxoanions, suggesting that vanadium modulates the electronic structure of the anion affecting the redox potentials.…”

Section: Introductionmentioning

confidence: 99%

Effect of positional isomerism and vanadium substitution on 51V magic angle spinning NMR Spectra Of Wells-Dawson polyoxotungstates

Gupta

Huang

Francesconi

et al. 2017

Solid State Nuclear Magnetic Resonance

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We examined the effect of positional isomerism and vanadium substitution on the 51V magic angle spinning NMR spectra of potassium salts of vanadium-substituted polyoxotungstates of the Wells-Dawson series. NMR parameters of this class of catalytically active polyoxotungstates are reported. Multiple species, indicative of differences in the local environment at the substitution sites, are observed in solid-state NMR spectra of the di- and tri-substituted complexes in contrast to solution NMR spectra, where single average chemical shift was observed. The quadrupolar and chemical shift anisotropy parameters depend strongly on the position and the degree of the vanadium substitution into the oxoanion core establishing 51V SATRAS NMR spectroscopy as a sensitive probe of the local electronic environment in these catalytically active solids.

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“…Several methods, such as dehydrogenation and catalytic oxidation, have been developed for this purpose [1][2][3][4][5]. Generally, the reported oxidation reactions involve stoichiometric quantities of inorganic oxidants, toxic or hazardous oxidizing agents [5].…”

Section: Introductionmentioning

confidence: 99%