Study of mixed-oxide catalysts containing bismuth, vanadium and antimony. Preparation, phase composition, spectroscopic characterization and catalytic oxidation of propene

Schuhl, Y.; Baussart, H.; Delobel, R.; Bras, Michel Le; Leroy, Jean-Marie; Gengembre, L.; Grimblot, J.

doi:10.1039/f19837902055

Cited by 100 publications

(66 citation statements)

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“…As a result, two types of Fe ions can be identified in the spectrum with Fe 2p 3/2 and 2p 1/2 binding energies of 710.6/713.0 eV and 723.9/726.1 eV, respectively, and a spin-orbit split of approximately 13.2 eV. These binding energies are fully consistent with those reported in the literature [43,45,46] for Fe 3+ ions in FeO(OH), Fe 3 O 4 , Fe 2 O 3 , and FeBiO 3 compounds. Since the presence of satellite peaks is typical for Fe 2p 3/2 and 2p 1/2 emission lines of Fe 3+ ions and contributions from Fe 2+ ions (expected at 709.5 eV) cannot be found in the spectrum, we can conclude with confidence that only Fe 3+ ions are present on the surface of the spent Fe 3 BiO x /SiO 2 material.…”

Section: Resultssupporting

confidence: 87%

“…These binding energies are slightly higher than those reported previously for Bi 2 O 3 (i.e., 158.8 and 164.2 eV) [46] but match closely with the Bi 4f 7/2 and 4f 5/2 binding energies reported for various mixed oxides, including FeBiO 3 (i.e., 159.1 and 164.4 eV, respectively) [47]. While higher binding energies of Bi in the latter case can be explained by electron transfer from the Bi cations towards other components of mixed oxides [46], the Bi 4f 7/2 and 4f 5/2 binding energies determined from our spectra are consistent with Bi 3+ cations being present on the surface of the spent Fe 3 BiO x /SiO 2 material, as no any contributions from Bi 5+ cations (expected at 161.5 and 167.0 eV for 4f 7/2 and 4f 5/2 core level emissions, respectively) can be observed in XPS spectra. The Fe 2p XPS region is more complex and includes besides 2p 3/2 and 2p 1/2 spin-orbit doublet components the corresponding satellite peaks at 718.2 and 731.7 eV, respectively (Fig.…”

Section: Resultscontrasting

confidence: 57%

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Ammoxidation of propane to acrylonitrile over silica-supported Fe-Bi nanocatalysts

Adams

Elpitiya

Khivantsev

et al. 2015

Applied Catalysis A: General

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a b s t r a c tAmmoxidation of propane to acrylonitrile was examined over a Fe 3 BiO x /SiO 2 sample prepared by thermal decarbonylation of [Et 4 N][Fe 3 (CO) 10 ( 3 -Bi)] on the surface of mesoporous silica. Catalytic measurements performed at 500 • C showed that this sample yields 49% acrylonitrile selectivity at 36% propane conversion when a 5.5%C 3 H 8 /30%O 2 /11%NH 3 /He balance reaction mixture was used at a GHSV of 1360 h −1 . HRSTEM, EDS, and XPS measurements indicate that mixed Fe 3 BiO 6 oxide particles less than 2 nm in size were formed on the surface of this material under reaction conditions. A Fe/Bi atomic ratio in these particles is approximately 3:1 and the Fe and Bi ions both are in the +3 oxidation state. A Fe-Bi/SiO 2 sample prepared by co-impregnation of individual Fe and Bi salts had very low activity and low selectivity for acrylonitrile formation from propane under similar experimental conditions due to larger sizes of particles formed under reaction conditions and enrichment of their surface with Fe.

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Section: Resultssupporting

confidence: 87%

Section: Resultscontrasting

confidence: 57%

Ammoxidation of propane to acrylonitrile over silica-supported Fe-Bi nanocatalysts

Adams

Elpitiya

Khivantsev

et al. 2015

Applied Catalysis A: General

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“…3. The binding energies of Bi4f 7∕2 (159.0 eV), V2p 3∕2 (516.7 eV), and O1s (529.7 eV) of the BiVO 4 thin film calcined at 673 K were coincident with literature's data of BiVO 4 (s-m) (48,49). The deconvoluted O1s peak at 531.6 eV was assigned to surface hydroxyl groups (50,51).…”

mentioning

confidence: 80%

Facile fabrication of an efficient BiVO ₄ thin film electrode for water splitting under visible light irradiation

Jia

Iwashina²,

Kudo³

2012

Proc. Natl. Acad. Sci. U.S.A.

292

186

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An efficient BiVO 4 thin film electrode for overall water splitting was prepared by dipping an F-doped SnO 2 (FTO) substrate electrode in an aqueous nitric acid solution of BiðNO 3 Þ 3 and NH 4 VO 3 , and subsequently calcining it. X-ray diffraction of the BiVO 4 thin film revealed that a photocatalytically active phase of scheelite-monoclinic BiVO 4 was obtained. Scanning electron microscopy images showed that the surface of an FTO substrate was uniformly coated with the BiVO 4 film with 300-400 nm of the thickness. The BiVO 4 thin film electrode gave an excellent anodic photocurrent with 73% of an IPCE at 420 nm at 1.0 V vs. Ag∕AgCl. Modification with CoO on the BiVO 4 electrode improved the photoelectrochemical property. A photoelectrochemical cell consisting of the BiVO 4 thin film electrode with and without CoO, and a Pt counter electrode was constructed for water splitting under visible light irradiation and simulated sunlight irradiation. Photocurrent due to water splitting to form H 2 and O 2 was confirmed with applying an external bias smaller than 1.23 V that is a theoretical voltage for electrolysis of water. Water splitting without applying external bias under visible light irradiation was demonstrated using a SrTiO 3 ∶Rh photocathode and the BiVO 4 photoanode.hydrogen production | solar energy conversion | visible light response T he development of powdered photocatalysts and semiconductor photoelectrodes for water splitting have been studied extensively in view of utilization of solar energy, since the report of the Honda-Fujishima effect (1). There are advantageous and disadvantageous points for water splitting using the powdered photocatalysts and photoelectrochemical cells. Although a powdered photocatalyst system is simple, H 2 and O 2 are produced as a mixture. In contrast to it, photoelectrochemical cells give H 2 separately from O 2 gas. Moreover, even if powdered photocatalysts do not possess band potentials suitable for water splitting (the bottom of the conduction band <0 V and the top of the valence band >1.23 V vs. NHE at pH 0), water splitting may be achieved by application of these powdered photocatalysts to photoelectrodes with applying some external bias. However, the electrical conductivity of semiconductor electrode is indispensable, resulting in that the number of the photoelectrode materials is limited.It has been reported that many metal oxides are active photocatalysts for water splitting into H 2 and O 2 stoichiometrically under UV light irradiation (2). Photoelectrodes, such as TiO 2 (1, 3, 4), SrTiO 3 (5, 6), BaTiO 3 (7), and KTaO 3 (8) have been reported for photoelectrochemical water splitting under UV light irradiation. Development of a photoelectrode material with visible light response has been sought for efficient utilization of solar energy. It has been reported that Fe 2 O 3 (9-11), WO 3 (12-14), BiVO 4 (15-24), and SrTiO 3 ∶Rh (25) of metal oxide electrodes respond to visible light. Recently, some (oxy) nitride materials such as TaON (26,27), Ta 3 N 5 (27, 28), SrN...

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“…Three fairly well resolved peaks might be seen in Fig. 1, indicating that three different data sets (corresponding to V 2 O 5 , 516.3 [14,17] 516.4 [18] 516.45 [19] 516.5 [20] 516.55 [13, 517.3 [28] 517.4 [20,[29][30][31] 517.45 [19] 517.6 [13] 517.65 [32] 517.7 [32][33][34] VO 2 , and V 2 O 3 reference samples) are involved in the distribution function. Further analysis was done assuming that the reference data for individual oxides are distributed according to the Gaussian law:…”

Section: Literature Analysismentioning

confidence: 99%

Valence of vanadium in hydrated compounds

Bondarenka¹

2007

Lithuanian J. Phys.

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Problems of the definition of vanadium chemical states in the mixed valency compounds are examined. The statistical analysis of the literature data on the values of binding energy and full width at half maximum (FWHM) of V 2p 3/2 peaks in different vanadium oxides is carried out.X-ray photoelectron spectroscopy was used to determine the chemical shift and FWHM of V 2p peaks of V 4+ and V 5+cations in the vanadium pentoxide matrix of hydrated vanadium compounds HV12O31·nH2O and (VO)V12O31·nH2O, prepared by using sol-gel technology. It was found that the binding energy of V 4+ ions shifts to the lower energy side of about 1.3 eV as compared to the main V 5+ ions in the matrix. The V 2p 3/2 line width for tetra-valent vanadium ions in xerogels is actually the same as for penta-valent ions.

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Study of mixed-oxide catalysts containing bismuth, vanadium and antimony. Preparation, phase composition, spectroscopic characterization and catalytic oxidation of propene

Cited by 100 publications

References 0 publications

Ammoxidation of propane to acrylonitrile over silica-supported Fe-Bi nanocatalysts

Ammoxidation of propane to acrylonitrile over silica-supported Fe-Bi nanocatalysts

Facile fabrication of an efficient BiVO ₄ thin film electrode for water splitting under visible light irradiation

Valence of vanadium in hydrated compounds

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Study of mixed-oxide catalysts containing bismuth, vanadium and antimony. Preparation, phase composition, spectroscopic characterization and catalytic oxidation of propene

Cited by 100 publications

References 0 publications

Ammoxidation of propane to acrylonitrile over silica-supported Fe-Bi nanocatalysts

Ammoxidation of propane to acrylonitrile over silica-supported Fe-Bi nanocatalysts

Facile fabrication of an efficient BiVO 4 thin film electrode for water splitting under visible light irradiation

Valence of vanadium in hydrated compounds

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Facile fabrication of an efficient BiVO ₄ thin film electrode for water splitting under visible light irradiation