Elucidating structure and function of active sites in VO /TiO2 catalysts during oxyhydrative scission of 1-butene by in situ and operando spectroscopy

Bentrup, Ursula; Brückner, Angelika; Rüdinger, Christoph; Eberle, Hans-Jürgen

doi:10.1016/j.apcata.2004.04.027

Cited by 35 publications

(27 citation statements)

References 25 publications

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“…Coupling of different kinds of semiconductor photocatalysts is a promising way and can enhance photocatalytic response to visible light by increasing the charge separation and extending wavelength for photoexcitation, so that the photocatalytic efficiency for liquid and gas phase reactions was increased [8,9]. Recently, most studies have been focused on the photocatalytic properties of metal ion-doped TiO 2 , such as Fe [10], Cr [11], Co [12], Mn [13], Ag [14] and V [15] ions. The doping of metal ions, especially transition metal ions, makes it possible for TiO 2 to absorb visible light.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of methyl orange with W-doped TiO2 synthesized by a hydrothermal method

Tian

et al. 2008

Materials Chemistry and Physics

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a b s t r a c tNanosized W-doped TiO 2 photocatalysts were synthesized by a simple hydrothermal method, and characterized by energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), transmission electron microscopy (TEM) and BET surface area analyzer. The photocatalytic activity of undoped TiO 2 and Wdoped TiO 2 photocatalysts was evaluated by the photocatalytic oxidation degradation of methyl orange in aqueous solution. The results show that the photocatalytic activity of the W-doped TiO 2 photocatalyst is much higher than that of undoped TiO 2 , and the optimum percentage of W doped is 2.0 mol%. The enhanced photocatalytic activity of the doped photocatalyst may be attributed to the increase in the charge separation efficiency and the presence of surface acidity.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of methyl orange with W-doped TiO2 synthesized by a hydrothermal method

Tian

et al. 2008

Materials Chemistry and Physics

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“…The appearance of adsorbed acetate species may be explained by formation of acetic acid which is partly adsorbed as acetate at the catalyst surface. If the reaction is carried out in the presence of water vapor, the same adsorbed species were detected, however, essentially less anhydride species were formed [7] and [8]. Obviously, water selectively suppresses the side reaction leading to cyclic anhydride species and blocks adsorption sites.…”

Section: Resultsmentioning

confidence: 75%

“…UV-vis measurements have been applied to observe changes in the range for d-d transitions of reduced vanadium species in dependence on time. Two pseudo-first-order processes had to be assumed for both reduction and re-oxidation [7] and [8]. Probably, the fast process (rate constant k 1 ) comprises VO x species on the surface that are readily exposed to reactants while the slow process (rate constant k 2 ) might be related to VO x sites in deeper layers, e.g., in the bulk of the VO x particles.…”

Section: Resultsmentioning

confidence: 99%

“…The catalysts have been prepared: (1) FT-IR spectra were recorded from self-supporting discs using a Bruker IFS 66 spectrometer equipped with a IR reaction cell [7]. Prior exposing to the reaction mixture (3 vol.% C 4 , 8 vol.% O 2 , 3 vol.% H 2 O/N 2 ), the samples were activated in air at 400 °C for 30 min.…”

Section: Methodsmentioning

confidence: 99%

“…Recent own investigations [6], [7] and [8] evidenced that only catalysts with vanadia supported on redox active oxides such as TiO 2 act effectively in the OHS of 1-butene to acetic acid whereas the vanadia content is of subordinate importance.…”

Section: Introductionmentioning

confidence: 99%

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Structure–reactivity relationships in VO /TiO2 catalysts for the oxyhydrative scission of 1-butene and n-butane to acetic acid as examined by in situ-spectroscopic methods and catalytic tests

et al. 2006

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Different VO x /TiO 2 catalyst have been catalytically tested and studied by in situ-spectroscopic methods (FT-IR, UV/vis, EPR) in the oxyhydrative scission (OHS) of 1-butene and n-butane to acetic acid (AcOH). While 1-butene OHS follows the sequence butane → butoxide → ketone → AcOH/acetate with a multitude of side products also formed, n-butane OHS leads to AcOH, CO x and H 2 O only. Water vapour in the feed improves AcOH selectivity by blocking adsorption sites for acetate. The admixture of Sb 2 O 3 was found to improve AcOH selectivity which is due to deeper V reduction under steady state conditions and lowering of surface acidity. VO x /TiO 2 catalysts with sulfate-containing anatase are the most effective ones. Covalently bonded sulfate at the catalyst surface causes specific bonding of VO x , stabilizes active V species and ensures their high dispersity.

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Nanostructured Vanadia‐Titania Catalysts with Hierarchical Architecture in the Oxyhydrative Scission of 1‐Butene to Acetic Acid

Stelzer¹,

Fait

Bentrup

et al. 2004

Chem Eng & Technol

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The synthesis of hierarchically designed supported vanadia‐titania catalysts and their properties in the oxyhydrative scission (OHS) of 1‐butene to acetic acid (AA) is described. The interaction of the TiO2 support with V2O5 appears to be responsible for an enhanced catalytic performance, and it is proposed that the catalytic activity is related to the number and size of the contact zones between the support and the active component.

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Elucidating structure and function of active sites in VO /TiO2 catalysts during oxyhydrative scission of 1-butene by in situ and operando spectroscopy

Cited by 35 publications

References 25 publications

Photocatalytic degradation of methyl orange with W-doped TiO2 synthesized by a hydrothermal method

Photocatalytic degradation of methyl orange with W-doped TiO2 synthesized by a hydrothermal method

Structure–reactivity relationships in VO /TiO2 catalysts for the oxyhydrative scission of 1-butene and n-butane to acetic acid as examined by in situ-spectroscopic methods and catalytic tests

Nanostructured Vanadia‐Titania Catalysts with Hierarchical Architecture in the Oxyhydrative Scission of 1‐Butene to Acetic Acid

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