Oxidation of toluene to benzoic acid over modified V2O5-TiO2 catalyst with SeO2, TeO2 and Sb2O3

Miki, Jun; Osada, Yo; Tachibana, Yakudo; Shikada, Tsutomu

doi:10.1007/bf00813692

Cited by 13 publications

(3 citation statements)

References 19 publications

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“…The great industrial importance of toluene-derived products has made this topic a subject of much research . Several recent papers report some success in the catalytic oxidation on vanadium oxide and other oxide surfaces − and on zeolites. , Some polyoxometalates catalyze the photocatalytic oxidation of side-chain aromatics in solution using λ irr ≥ 320 nm 18 or ≥ 270 nm . On the basis of our recent success with UO 2 2+ as a photocatalyst for the oxidation of alkanes and alkenes in aqueous solution using visible light, one might expect that toluene would also be oxidized under these conditions.…”

Section: Introductionmentioning

confidence: 99%

“…The great industrial importance of toluene-derived products has made this topic a subject of much research. 12 Several recent papers report some success in the catalytic oxidation on vanadium oxide and other oxide surfaces [13][14][15] and on zeolites. 16,17 Some polyoxometalates catalyze the photocatalytic oxidation of side-chain aromatics in solution using λ irr g 320 nm 18 or g 270 nm.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Oxidation of Toluene to Benzaldehyde by Molecular Oxygen

and

Bakač

1996

J. Phys. Chem.

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The visible light irradiation of aqueous solutions containing toluene, uranyl(VI) ions, and O 2 results in the formation of benzaldehyde as a major product. Small amounts of PhCH 2 OH are also formed. The yields of benzaldehyde are 3 times greater for toluene-h 8 than for toluene-d 8 , but the kinetic isotope effect for the quenching of the excited state *UO 2 2+ by toluene is negligible (k toluene-h 8 /k toluene-d 8 ) 1.2). This and other evidence indicate that the quenching takes place in two parallel pathways. The major one involves the aromatic portion of toluene and leads to the recovery of the reactants. The minor, productive path takes place by hydrogen atom abstraction from the methyl group, followed by the oxidation of PhCH 2 • . Cumene, benzyl alcohol, and benzaldehyde react similarly.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocatalytic Oxidation of Toluene to Benzaldehyde by Molecular Oxygen

and

Bakač

1996

J. Phys. Chem.

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“…Titania-supported vanadia catalysts have been subjected to investigation by various researchers as they find extensive application in synthesis of phthalic anhydride from o -xylene, , selective catalytic reduction (SCR) of NO x , , partial oxidation, , and ammoxidation , reactions. In comparison with carriers like Al 2 O 3 , SiO 2 , and ZrO 2 , TiO 2 -supported vanadia catalysts were found to exhibit higher activities and selectivities, which was attributed to the strong oxide support interaction (SOSI) that results in the formation of a well-dispersed monolayer of surface vanadia species .…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic and Activity Studies on Vanadia Supported on Titania and Phosphorus-Modified Titania

Alyea

Lakshmi

1997

Langmuir

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A series of catalysts with vanadia contents varying between 1 and 14 wt % were prepared on titania (Degussa) and phosphorus-modified titania. The catalysts were characterized by employing BET surface area, X-ray diffraction (XRD), electron spin resonance (ESR), FT- Raman (FT-Raman), and 51V solid state nuclear magnetic resonance (51V NMR) spectroscopy. The activities of the catalysts were tested in the ethanol partial oxidation reaction. XRD studies indicated the formation of V2O5 microcrystallites only at the highest loading of 14 wt % in both series of catalysts. FT-Raman studies indicated the formation of microcrystalline V2O5 species beyond 5.4 wt % loading (V−Ti 3) in the TiO2-supported catalysts and 2.8 wt % (V−PTi 2) in the phosphorus-modified samples. 51V NMR spectra of the V2O5/TiO2 catalysts showed the presence of both octahedral (a peak at −310 ppm) and tetrahedral vanadia species (a shoulder peak at −500 ppm) in the samples up to 5.4 wt % V2O5; beyond this loading only the peak corresponding to octahedrally coordinated vanadia species was observed. V2O5 supported on phosphorus-modified TiO2 exhibited peaks corresponding to only octahedrally coordinated vanadia at all loadings studied. The ESR spectra of the V−Ti catalysts exhibited hyperfine lines corresponding to VO6c 2+ or VO5c 2+ species. The ESR spectra of V−PTi samples were found to be more complex with two kinds of signals with both broad and sharp hyperfine lines with different peak to peak line widths, which may correspond to the presence of VO6c 2+ or VO5c 2+ and V6c 4+ species. Ethanol partial oxidation activities of the catalysts decreased upon phosphorus addition to titania, turnover frequency for these catalysts being 3 orders of magnitude less than that for the unmodified samples.

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From I‐Ligated and I‐Doped to O‐Ligated Hafnium(IV) Phthalocyaninate(2–) Complexes

Janczak

Kubiak

2014

Eur J Inorg Chem

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Treatment of HfPcI2·Pht (Pc = C32H16N82–; Pht = phthalonitrile) or bromide analogue HfPcBr2·Pht with acetylacetone (acacH) led to the formation of a HfPc(acac)2 complex that, depending on the crystallization conditions, crystallized with solvent acacH molecules to form mono‐ and disolvate crystals: HfPc(acac)2·acacH (1) and HfPc(acac)2·2acacH (2). Treatment of the partially oxidized iodine sandwich‐type hafnium(IV) diphthalocyanine HfPc2(I3)2/3, in which two of three HfPc2 units are a one‐electron‐oxidized [HfPc2]+ unit with a π‐radical character, with benzonitrile (BN) or 4‐methylpyridine (4‐Mepy) under ambient conditions led to the formation of μ2(O,OH)(C6H5COO)(HfPc)2 (3), which is bridged by O2– and OH– and stapled together by deprotonated benzoic acid complex, and μ2(O,OH)(C5H4NCOO)(HfPc)2 (4), which is bridged by O2– and OH– and stapled by deprotonated isonicotinic acid. Complexes 1–4 were structurally characterized by X‐ray single‐crystal analysis. In these complexes, the eight or seven coordination number of the closed‐shell (d0) Hf4+ cation is saturated by four isoindole nitrogen atoms of the phthalocyaninate macrocycle and by four oxygen atoms in 1 and in 2 or three oxygen atoms in 3 and 4. Interaction of the Hf4+ cation with the isoindole nitrogen atoms of Pc macrocycle led to the distortion of the aromatic Pc macrocycle to the flattened crown, with the Hf4+ cation about 1.2 Å out of the N4‐isoindole plane of the Pc macrocycle. The complexes were also characterized by UV/Vis spectroscopy.

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Oxidation of toluene to benzoic acid over modified V2O5-TiO2 catalyst with SeO2, TeO2 and Sb2O3

Cited by 13 publications

References 19 publications

Photocatalytic Oxidation of Toluene to Benzaldehyde by Molecular Oxygen

Photocatalytic Oxidation of Toluene to Benzaldehyde by Molecular Oxygen

Spectroscopic and Activity Studies on Vanadia Supported on Titania and Phosphorus-Modified Titania

From I‐Ligated and I‐Doped to O‐Ligated Hafnium(IV) Phthalocyaninate(2–) Complexes

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