Total oxidation of benzene and chlorobenzene with MoO3- and WO3-promoted V2O5/TiO2 catalysts prepared by a nonhydrolytic sol–gel route

Debecker, Damien P.; Delaigle, Romain; Bouchmella, Karim; Eloy, Pierre; Gaigneaux, Éric M.; Mutin, P. Hubert

doi:10.1016/j.cattod.2010.02.010

Cited by 68 publications

(33 citation statements)

References 25 publications

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“…While the Re species in as-prepared samples are homogeneously dispersed in the bulk, the calcined xerogels exhibit an increase of the surface Re/(Re + Si + Al) atomic ratio corresponding to migration of Re to the surface upon thermal treatment (Figure 6). Similar behavior was previously reported for vanadium, molybdenum, and tungsten in Ti-O-V, Ti-O-V-O-Mo, Ti-O-V-O-W, and Si-O-Al-O-Mo mixed oxide catalysts prepared by NHSG and was explained by a low Tammann temperature of the respective metal oxides allowing for their migration at increased temperatures [179][180][181].…”

Section: New Compositionssupporting

confidence: 66%

“…Decomposition of these pollutants, represented mostly by chlorinated aromatics, can be catalyzed by so-called total oxidation catalysts. These were prepared by the group of Debecker and were based on MoO 3 -and WO 3 -V 2 O 5 -TiO 2 oxides [179,181]. The authors reported high conversions of benzene and chlorobenzene especially in the case of samples with 10 wt % V 2 O 5 loadings.…”

Section: Heterogeneous Catalystsmentioning

confidence: 99%

“…Oxide materials with the composition V2O5-MoO3-TiO2 or V2O5-WO3-TiO2 were prepared from chloride precursors by the same group [181]. Surface areas of the resulting samples ranged from 53 to 109 m 2 ·g −1 with the pore diameters of about 10 nm.…”

Section: New Compositionsmentioning

confidence: 99%

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The Power of Non-Hydrolytic Sol-Gel Chemistry: A Review

et al. 2017

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This review is devoted to non-hydrolytic sol-gel chemistry. During the last 25 years, non-hydrolytic sol-gel (NHSG) techniques were found to be attractive and versatile methods for the preparation of oxide materials. Compared to conventional hydrolytic approaches, the NHSG route allows reaction control at the atomic scale resulting in homogeneous and well defined products. Due to these features and the ability to design specific materials, the products of NHSG reactions have been used in many fields of application. The aim of this review is to present an overview of NHSG research in recent years with an emphasis on the syntheses of mixed oxides, silicates and phosphates. The first part of the review highlights well known condensation reactions with some deeper insights into their mechanism and also presents novel condensation reactions established in NHSG chemistry in recent years. In the second section we discuss porosity control and novel compositions of selected materials. In the last part, the applications of NHSG derived materials as heterogeneous catalysts and supports, luminescent materials and electrode materials in Li-ion batteries are described.

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Section: New Compositionssupporting

confidence: 66%

Section: Heterogeneous Catalystsmentioning

confidence: 99%

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The Power of Non-Hydrolytic Sol-Gel Chemistry: A Review

et al. 2017

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“…Unfortunately, conventional mixed oxides synthesis techniques do not usually produce homogeneous materials with high surface area. On the contrary, the sol-gel synthesis [15][16][17][18] reduces the number of preparation steps and allows the strict control of the physicochemical properties and of the homogeneity of the final materials. In particular, the sol-gel method stabilizes the surface area and the pore volume of the catalysts with respect to the traditional synthetic procedures.…”

Section: Introductionmentioning

confidence: 99%

Aerogel and xerogel WO3/ZrO2 samples for fine chemicals production

Signoretto

Ghedini

Menegazzo

et al. 2013

Microporous and Mesoporous Materials

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a b s t r a c t WO 3 /ZrO 2 systems were prepared by sol-gel technique using different procedures for the solvent extraction: evaporation in vacuum at room temperature (xerogel) and extraction in supercritical conditions (aerogel). Two reactions of industrial interest were investigated under mild conditions: (i) acylation of veratrole with acetic anhydride; (ii) acylation of anisole with benzoic anhydride. Several techniques were employed in order to study the influence of the synthetic parameters on texture and catalytic activity: N 2 physisorption, Fourier transformed-infrared spectroscopy, X-ray photoelectron spectroscopy, temperature programmed reduction and temperature programmed oxidation analyses. The solvent extraction strongly influences metal reducibility, surface area, pores organisation, W/Zr surface density and metallic interactions. The aerogel sample shows the best catalytic results for both conversion and yield. The supercritical extraction plays a central role especially in the recycling: by proper air activation, the aerogel sample attains the complete restoration of the catalytic activity even after three runs.

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“…Numerous catalysts have been reported for CVOC purification, with the research mainly focused on the noble metals [13][14][15][16][17] and transition metal oxides [18][19][20][21][22][23][24][25][26][27]. Abundant polychlorinated by-products were generated in the catalytic oxidation of CVOCs over the noble metals Pt and Pd [28,29].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Oxidation of Chlorobenzene over Ruthenium-Ceria Bimetallic Catalysts

et al. 2018

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Abstract:A series of Ru-based mono and bimetallic materials were prepared and evaluated in the catalytic oxidation of chlorobenzene. Among the different Ru-based catalysts, 1Ru/TiO 2 (P25) was the most active catalyst and contributed the lowest complete oxidation temperature, suggesting that commercial P25 TiO 2 was the best support for Ru catalysts. After ceria oxides were introduced into the Ru catalytic system, the catalytic activity of 1Ru-5Ce/TiO 2 (Rutile) dramatically improved and that of P25 supported catalysts was decreased. Comparing the chlorobenzene consumption rates for 1Ru/TiO 2 and 1Ru-5Ce/TiO 2 at 280 • C, it could be concluded that monometallic Ru catalytic system was appropriate for P25 support, and the Ru-Ce bimetallic catalytic system was suitable for the rutile TiO 2 support. At 280 • C, for 1Ru-5Ce/TiO 2 (Rutile) and 1Ru-5Ce/TiO 2 (P25), the chlorobenzene conversion was stabilized at approximately 91% and 86%, respectively. According to the physicochemical properties of the catalysts as characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), and Hydrogen temperature programmed reduction (H 2 -TPR), it can be concluded that (a) electrophilic O ads species play an important role in VOCs oxidation; (b) abundant RuO 2 nanoparticles on the surface of 1Ru-5Ce/TiO 2 (Rutile) result in higher catalytic activity and stability; and (c) dispersion is not the major factor for the catalytic activity, rather the unique structure greatly facilitated the catalytic activity and stability.

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Total oxidation of benzene and chlorobenzene with MoO3- and WO3-promoted V2O5/TiO2 catalysts prepared by a nonhydrolytic sol–gel route

Cited by 68 publications

References 25 publications

The Power of Non-Hydrolytic Sol-Gel Chemistry: A Review

The Power of Non-Hydrolytic Sol-Gel Chemistry: A Review

Aerogel and xerogel WO3/ZrO2 samples for fine chemicals production

Catalytic Oxidation of Chlorobenzene over Ruthenium-Ceria Bimetallic Catalysts

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