Reactivity of Molybdovanadophosphoric Acids: Influence of the Presence of Vanadium in the Primary and Secondary Structure

Casarini, Daniele; Centi, Gabriele; Jírů, P.; Lena, Virginia; Tvarůžková, Z.

doi:10.1006/jcat.1993.1280

Cited by 94 publications

(64 citation statements)

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“…It is well known that vanadium-containing HPAs have a strong reduction potential (oxidizing power) [163]. 62 catalysts also showed volcanoshaped curves and exhibited the same trend with respect to vanadium substitution.…”

Section: Epoxidation Of Alkenes With H 2 Omentioning

confidence: 62%

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Heravi

Sadjadi

2009

JICS

111

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Heteropolyacids, their salts and polyoxometalates have been used as catalysts in wide range of organic reactions such as multi components, oxidation, reductions, electrochemical and photochemical reactions. There have been tremendous and continued efforts to modify the catalytic performance of heteropoly acids such as supporting them on MCM, silica gel, etc. In this review, we have attempted to bring some of new applications of heteropolyacids in organic reactions and recent approaches on modifying them, into focus.

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Section: Epoxidation Of Alkenes With H 2 Omentioning

confidence: 62%

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Heravi

Sadjadi

2009

JICS

111

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“…In all experiments performed, the synthesized catalyst showed more activity and selectivity in the diphenylsulfide oxidation to sulfoxide than the corresponding PMo, especially when vanadium was incorporated. The PMoV catalyst shows unique catalyst features for oxidation due to its bifunctional character, which arises because of the redox nature of Vanadium and the oxidation/acidic character of the molybdophosphoric acid [34]. As reported by Song et al [1], the metal substitution may be modifying the energy and composition of the lowest unoccupied molecular orbital (LUMO) and consequently its redox properties.…”

Section: Selective Oxidation Of Diphenylsulfidementioning

confidence: 94%

Doped Keggin heteropolyacids as catalysts in sulfide oxidation

Palermo

Sathicq

Vázquez

et al. 2011

Reac Kinet Mech Cat

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In this research, we report the preparation of doped PMo Keggin heteropolyacids where Mo is partially replaced by V, Bi, and Bi-V. These catalysts were characterized by means of ICP-AES analysis, 31 P-NMR, UV-visible spectra, FT-IR spectra, thermal analysis, and textural properties. In addition, the activities of the synthesized catalysts were evaluated in the selective oxidation of sulfides to sulfoxides/sulfones. The incorporation of V, Bi and Bi-V into the structure of H 3 PMo 12 O 40 increases the catalytic activity. The two most active catalysts, those with V and V-Bi were supported on aminopropyl-functionalized silica (SiO 2 NH 2 ) and they were found to be and efficient heterogeneous catalysts for the selective oxidation of diphenylsulfide to the corresponding sulfoxide/sulfone.

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“…Vanadium-containing HPAs have been widely studied as catalysts for various oxidation reactions [26][27][28][29][30]. They showed excellent catalytic activities in several oxidation reactions such as oxidation of isobutyric acid [31], oxidation of methacrolein [32], oxidation of acrolein [33], and selective oxidation of alkane [34,35].…”

Section: Introductionmentioning

confidence: 99%

Redox Properties and Catalytic Oxidation Activities of Polyatom-Substituted H n PW11M1O40 (M = V, Nb, Ta, and W) Keggin Heteropolyacid Catalysts

et al. 2009

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Redox properties and catalytic oxidation activities of polyatom-substituted H n PW 11 M 1 O 40 (M = V, Nb, Ta, and W) Keggin heteropolyacids (HPAs) were examined. Reduction potentials and UV-visible absorption edge energies of H n PW 11 M 1 O 40 (M = V, Nb, Ta, and W) HPA catalysts in solution were determined by an electrochemical method and UV-visible spectroscopy measurements, respectively. It was observed that reduction potentials of H n PW 11 M 1 O 40 (M = V, Nb, Ta, and W) HPA catalysts increased and UV-visible absorption edge energies of the HPA catalysts decreased with decreasing electronegativity of substituted polyatom. It was also found that the lower absorption edge energy corresponded to the higher reduction potential of the HPA catalyst. Vapor-phase oxidation of benzyl alcohol was carried out as a model reaction to probe the redox properties of H n PW 11 M 1 O 40 (M = V, Nb, Ta, and W) HPA catalysts. Yield for benzaldehyde increased with increasing reduction potential and with decreasing absorption edge energy of the HPA catalyst, and in turn, with decreasing electronegativity of substituted polyatom. Reduction potential of H n PW 11 M 1 O 40 (M = V, Nb, Ta, and W) HPA catalysts measured by an electrochemical method and absorption edge energy of the HPA catalysts measured by UV-visible spectroscopy could be utilized as a probe of oxidation catalysis of the HPA catalysts.

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Reactivity of Molybdovanadophosphoric Acids: Influence of the Presence of Vanadium in the Primary and Secondary Structure

Cited by 94 publications

References 0 publications

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Recent developments in use of heteropolyacids, their salts and polyoxometalates in organic synthesis

Doped Keggin heteropolyacids as catalysts in sulfide oxidation

Redox Properties and Catalytic Oxidation Activities of Polyatom-Substituted H n PW11M1O40 (M = V, Nb, Ta, and W) Keggin Heteropolyacid Catalysts

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