Liquid phase oxidation of dibenzothiophene with alumina-supported vanadium oxide catalysts: An alternative to deep desulfurization of diesel

Gómez-Bernal, H.; Cedeño-Caero, Luis; Gutièrrez-Alejandre, Aı̀da

doi:10.1016/j.cattod.2008.08.018

Cited by 65 publications

(14 citation statements)

References 23 publications

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“…The TPR profiles exhibited a main reduction peak at nearly 240°C. This reduction peak arises from the reduction of V(?5) to V(?3) species and appears at temperatures clearly lower than that reported for supported V 2 O 5 , about 500-550°C [17,18], thereby revealing the catalytic effect of Pt in activating the dissociative chemisorption of hydrogen. Figure 3 shows that that the TPR traces shifted progressively to lower temperatures with increasing vanadia coverage.…”

Section: Catalyst Characterizationmentioning

confidence: 73%

Effect of V2O5 Loading on Propane Combustion over Pt/V2O5–Al2O3 Catalysts

et al. 2009

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Propane combustion was studied on Pt(0.4%)/ V 2 O 5 -Al 2 O 3 catalysts containing up to 20% V 2 O 5 . The density, strength and nature of surface acid sites were determined by TPD of NH 3 and FTIR spectra of adsorbed pyridine. The sample acidity increased with the vanadium content, essentially because the addition of vanadium oxide generated Brønsted acid sites. The Pt dispersion as determined by H 2 chemisorption increased with increasing V 2 O 5 loading. The sample activity for propane combustion was evaluated through both conversion versus temperature (light-off curves) and kinetically-controlled conversion versus time catalytic tests. The propane combustion turnover rate on Pt/V 2 O 5 -Al 2 O 3 increased with the amount of vanadium, probably because the intrinsic Pt oxidation activity increases with the sample acidity.

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Section: Catalyst Characterizationmentioning

confidence: 73%

Effect of V2O5 Loading on Propane Combustion over Pt/V2O5–Al2O3 Catalysts

et al. 2009

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“…Fortunately, the oxidative desulfurization (ODS) appears as a promising way to eliminate refractory 4,6‐DMDBT under mild conditions. [ 9–11 ] A wide variety of catalysts based on W, Mo, V, and Ti metals (including polyoxometalates (POMs) and their nanocomposites), [ 12,13 ] WO x ‐supported ZrO 2 , [ 14,15 ] tungsten nitride/porous carbon, [ 16 ] TiO 2 /porous glass, [ 2 ] monoclinic VO 2 , [ 17 ] V 2 O 5 /Al 2 O 3 , [ 18 ] titanium silicalite (TS‐1), [ 19 ] and titanate nanotubes [ 20 ] have been explored as ODS catalysts. However, it is still desirable to find more efficient ODS catalysts.…”

Section: Introductionmentioning

confidence: 99%

Confined Heteropoly Blues in Defected Zr‐MOF (Bottle Around Ship) for High‐Efficiency Oxidative Desulfurization

Xue

Yang

Qiao

et al. 2020

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The Keggin-type polyoxometalates (POMs) are effective catalysts for oxidative desulfurization (ODS) and confining these POMs in metal-organic frameworks (MOFs) is a promising strategy to improve their performances. Herein, postsynthetic modification of POMs confined in MOFs by adding thiourea creates more unsaturated metal sites as defects, promoting ODS catalytic activity. Additional modification by confining 1-butyl-3-methyl imidazolium POMs in MOFs is performed to obtain higher ODS activity, owing to the affinity between electron-rich thiophene-based compounds and electrophilic imidazolium compounds. The ODS catalytic activities of fourZr-MOF-based composites (bottle around ship) including phosphomolybdate acid (PMA)/UiO-66, [Bmim] 3 PMo 12 O 40 /UiO-66, PMA/Thiourea/UiO-66, and [Bmim] 3 PMo 12 O 40 /Thiourea/UiO-66 are therefore investigated in detail.In order to explore the catalytic mechanism of these MOF composites, their microstructures and electronic structures are probed by various techniques such as X-ray diffraction, thermogravimetric analysis, Fourier transform infrared, Raman, scanning electron microscope, transmission electron microscope, BET, X-ray photoelectron spectroscopy, EPR, UV-vis, NMR spectra, and H 2 -temperature-programmed reduction. The results reveal that phosphomolybdate blues and imidazolium phosphomolybdate blues with different Mo 5+ /Mo 6+ ratios with the Keggin structure are confined in defected UiO-66 for all four composites. This approach can be applied to design and synthesize other POMs/MOFs composites as efficient catalysts.

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“…Vanadium oxides and oxyhydroxides offer a well-furnished toolbox that contains a wide variety of compositions, structures, redox states, etc. This results in a large diversity of electrical, optical and intercalation properties, which can be implemented in many applications, especially in the fields of oxidative catalysis [1][2][3][4][5][6][7][8][9][10][11][12][13][14] (e.g. production of sulfuric acid 1 and maleic acid 15 ) and energy.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticles of Low-Valence Vanadium Oxyhydroxides: Reaction Mechanisms and Polymorphism Control by Low-Temperature Aqueous Chemistry

et al. 2016

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An aqueous synthetic route at 95 °C is developed to reach selectively three scarcely reported vanadium oxyhydroxides. Häggite VO(OH), Duttonite VO(OH), and Gain's hydrate VO(HO) are obtained as nanowires, nanorods, and nanoribbons, with sizes 1 order of magnitude smaller than previously reported. X-ray absorption spectroscopy provides evidence that vanadium in these phases is V. Combined with FTIR, XRD, and electron microscopy, it yields the first insights into formation mechanisms, especially for Häggite and Gain's hydrate. This study opens the way for further investigations of the properties of novel V (oxyhydr)oxides nanostructures.

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Liquid phase oxidation of dibenzothiophene with alumina-supported vanadium oxide catalysts: An alternative to deep desulfurization of diesel

Cited by 65 publications

References 23 publications

Effect of V2O5 Loading on Propane Combustion over Pt/V2O5–Al2O3 Catalysts

Effect of V2O5 Loading on Propane Combustion over Pt/V2O5–Al2O3 Catalysts

Confined Heteropoly Blues in Defected Zr‐MOF (Bottle Around Ship) for High‐Efficiency Oxidative Desulfurization

Nanoparticles of Low-Valence Vanadium Oxyhydroxides: Reaction Mechanisms and Polymorphism Control by Low-Temperature Aqueous Chemistry

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