V2O5/TiO2 and V2O5/TiO2–SO42− catalysts for the total oxidation of chlorobenzene: one-step sol–gel preparation vs. two-step impregnation

Gannoun, Chiraz; Delaigle, Romain; Ghorbel, Abdelhamid; Gaigneaux, Éric M.

doi:10.1039/c9cy00099b

Cited by 20 publications

(7 citation statements)

References 44 publications

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“…No diffraction peaks of sulfates are observed, demonstrating that sulfates were collected in pores without exposure. More diffraction peaks of MnO 2 and Mn 2 O 3 are exposed after sulfation, which might contribute to the slight promotion effect on CB oxidation by oxygen (Figure c). − The changes in the redox properties can be observed from Figure c. M-AS exhibits similar shape and size of H 2 -TPR profiles at a temperature lower than 500 °C compared with M-A.…”

Section: Resultsmentioning

confidence: 95%

Comparative Investigation on Chlorobenzene Oxidation by Oxygen and Ozone over a MnO_x/Al₂O₃ Catalyst in the Presence of SO₂

Lin

Wang

Zhang

et al. 2021

Environ. Sci. Technol.

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Catalytic oxidation of volatile organic compounds (VOCs) usually encounters complicated components in flue gas causing severe deactivation that restrict its application in specific conditions. The Cl substitution in chlorobenzene further increases poisoning risks. Ozone assistance has unique superiority that can overcome these bottleneck problems. Herein, this study performs a comparative investigation of CB oxidation by oxygen and ozone over a simple Mn/Al2O3 catalyst. CB conversion suffered from slight deactivation in oxygen atmosphere (from 90 to 70%) and more severe deactivation in the presence of SO2 (from 90 to 45%) at 480 °C. Introduction of ozone successfully attained high CB conversion at low temperature (120 °C) with excellent stability and less byproducts. Especially, CB oxidation by ozone maintained its original conversion in the presence of SO2. The deactivation process was simulated by synthesizing several sulfated catalysts. Direct sulfation on Mn/Al2O3 attained more severe deactivation in CB conversion and CO2 formation than sulfation on the Al2O3 support. Ozone with a strong oxidation property promoted the CB oxidation cycle, facilitated desorption of carbonaceous intermediates, and protected MnO x species from severe erosion, thus exhibiting high and stable performance in CB oxidation.

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Section: Resultsmentioning

confidence: 95%

Comparative Investigation on Chlorobenzene Oxidation by Oxygen and Ozone over a MnO_x/Al₂O₃ Catalyst in the Presence of SO₂

Lin

Wang

Zhang

et al. 2021

Environ. Sci. Technol.

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“…After a perusal of the extensive literature about TiO 2 -V 2 O 5 , one could wonder why we decided to test it as a gas sensor. Indeed, if we accept that the sensing material must promote total combustion of the analyte, we see that TiO 2 -V 2 O 5 is well known for the total oxidation of chlorobenzenes [160][161][162] and showed moderate activity toward benzene total oxidation [163]. Even though the detection of such compounds is surely of interest, it could still be a very niche application.…”

Section: Semiconducting Oxide-supported Catalystsmentioning

confidence: 99%

How Chemoresistive Sensors Can Learn from Heterogeneous Catalysis. Hints, Issues, and Perspectives

et al. 2021

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The connection between heterogeneous catalysis and chemoresistive sensors is emerging more and more clearly, as concerns the well-known case of supported noble metals nanoparticles. On the other hand, it appears that a clear connection has not been set up yet for metal oxide catalysts. In particular, the catalytic properties of several different oxides hold the promise for specifically designed gas sensors in terms of selectivity towards given classes of analytes. In this review, several well-known metal oxide catalysts will be considered by first exposing solidly established catalytic properties that emerge from related literature perusal. On this basis, existing gas-sensing applications will be discussed and related, when possible, with the obtained catalysis results. Then, further potential sensing applications will be proposed based on the affinity of the catalytic pathways and possible sensing pathways. It will appear that dialogue with heterogeneous catalysis may help workers in chemoresistive sensors to design new systems and to gain remarkable insight into the existing sensing properties, in particular by applying the approaches and techniques typical of catalysis. However, several divergence points will appear between metal oxide catalysis and gas-sensing. Nevertheless, it will be pointed out how such divergences just push to a closer exchange between the two fields by using the catalysis knowledge as a toolbox for investigating the sensing mechanisms.

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“…The interest to these mixed oxide solids is significant in connection with the band gap engineering and potential applications in catalysis, photocatalysis, energy storage, etc. [24][25][26][27][28][29]. An extension of the previously discussed nucleation and growth mechanism to the VTOA system completes this experimental work.…”

Section: Introductionmentioning

confidence: 74%

Nucleation and growth of mixed vanadium-titanium oxo-alkoxy nanoparticles in sol-gel synthesis

Mendez

Jia

Traoré

et al. 2021

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The mixed vanadium-titanium oxo-alkoxy (VTOA) nanoparticles were synthesized via sol-gel method in a chemical reactor with ultra-rapid micromixing. The nucleation and growth kinetics and particles size, followed by the static/dynamic light scattering methods, were quite different from those of pure oxo-alkoxy titanium (TOA) and vanadium (VOA) species. It was shown that the TOA species appear first and serve to be centres of attraction for hydrolysed VOA species at the nucleation stage. However, at the vanadium content above 20 mol% large VOA species imprison sub-nucleus TOA species prohibiting the nucleus appearance. The model analysis of the VTOA induction kinetics validated a significant increase of the nucleus size with an increase of the precursor concentration. The results support a new paradigm of the sol-gel process describing profound restructuring of the oxometallic species during assembling at the nucleation stage.

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V₂O₅/TiO₂ and V₂O₅/TiO₂–SO₄²⁻ catalysts for the total oxidation of chlorobenzene: one-step sol–gel preparation vs. two-step impregnation

Abstract: This paper examines the effect of the preparation method of sulfated and unsulfated V2O5/TiO2 catalysts on chlorobenzene total oxidation.

Cited by 20 publications

References 44 publications

Comparative Investigation on Chlorobenzene Oxidation by Oxygen and Ozone over a MnO_x/Al₂O₃ Catalyst in the Presence of SO₂

Comparative Investigation on Chlorobenzene Oxidation by Oxygen and Ozone over a MnO_x/Al₂O₃ Catalyst in the Presence of SO₂

How Chemoresistive Sensors Can Learn from Heterogeneous Catalysis. Hints, Issues, and Perspectives

Nucleation and growth of mixed vanadium-titanium oxo-alkoxy nanoparticles in sol-gel synthesis

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V2O5/TiO2 and V2O5/TiO2–SO42− catalysts for the total oxidation of chlorobenzene: one-step sol–gel preparation vs. two-step impregnation

Abstract: This paper examines the effect of the preparation method of sulfated and unsulfated V2O5/TiO2 catalysts on chlorobenzene total oxidation.

Cited by 20 publications

References 44 publications

Comparative Investigation on Chlorobenzene Oxidation by Oxygen and Ozone over a MnOx/Al2O3 Catalyst in the Presence of SO2

Comparative Investigation on Chlorobenzene Oxidation by Oxygen and Ozone over a MnOx/Al2O3 Catalyst in the Presence of SO2

How Chemoresistive Sensors Can Learn from Heterogeneous Catalysis. Hints, Issues, and Perspectives

Nucleation and growth of mixed vanadium-titanium oxo-alkoxy nanoparticles in sol-gel synthesis

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V₂O₅/TiO₂ and V₂O₅/TiO₂–SO₄²⁻ catalysts for the total oxidation of chlorobenzene: one-step sol–gel preparation vs. two-step impregnation

Comparative Investigation on Chlorobenzene Oxidation by Oxygen and Ozone over a MnO_x/Al₂O₃ Catalyst in the Presence of SO₂

Comparative Investigation on Chlorobenzene Oxidation by Oxygen and Ozone over a MnO_x/Al₂O₃ Catalyst in the Presence of SO₂