Mechanism of Vapor-Phase Oxidation of Anthracene over Vanadium Pentoxide Catalyst

Subramanian, P.; Murthy, M.S.S.

doi:10.1021/i260050a004

Cited by 9 publications

(4 citation statements)

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“…Benzaldehyde can be generated via the partial oxidation of toluene. A two-step redox reaction mechanism has been proposed by Subramanian and Murthy, , in which the adsorbed toluene is first oxidized by active oxygen species, followed by the reduced catalyst being re-oxidized by gaseous oxygen for recovery. …”

Section: Resultsmentioning

confidence: 99%

Synergistic Elimination of NO_x and Chloroaromatics on a Commercial V₂O₅–WO₃/TiO₂ Catalyst: Byproduct Analyses and the SO₂ Effect

Jiang

et al. 2019

Environ. Sci. Technol.

132

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The synergistic control of multipollutants is the frontier of environmental catalysis. This research is in the infancy stage, and many uncertainties still remain. Herein, we investigated the reaction characteristics of synergistic elimination of NO x and chloroaromatics on a commercial V2O5–WO3/TiO2 catalyst. The reaction byproducts were qualitatively and quantitatively analyzed, and their origins were clarified. In particular, the origins of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) from the synergistic reaction with or without SO2 were first explored; this is crucial for assessing the environmental risk by applying such a synergistic system. Experimental results indicate that during the synergistic reaction, the V2O5–WO3/TiO2 catalyst was deactivated at 200 and 250 °C, whereas the 300 °C was sufficient to durably convert the NO and chlorobenzene at the turnover frequency (TOF) of 7.23 × 10–4 and 1.32 × 10–4 s–1, respectively. A range of aromatics, alkenes, and alkanes, particularly their chlorinated congeners, were observed in the off-gases and on the catalyst surface, where those of 3-chlorobenzonitrile, 4-chloro-2-nitrophenol, and inorganic CS2 were first discovered. In the time-on-stream test at 250 °C, the PCDD/Fs collected from the off-gases was measured at 0.0514 ng I-TEQ Nm–3, but the most toxic dioxins congener, 2,3,7,8-TCDD, was not observed. The alkalinity of selective catalytic reduction reaction likely facilitated the chlorophenol formation, which eventually promoted PCDD/F generation. The SO2 was found to benefit polychlorinated byproduct generation, but the addition of which distinctly inhibited PCDD/F formation.

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Section: Resultsmentioning

confidence: 99%

Synergistic Elimination of NO_x and Chloroaromatics on a Commercial V₂O₅–WO₃/TiO₂ Catalyst: Byproduct Analyses and the SO₂ Effect

Jiang

et al. 2019

Environ. Sci. Technol.

132

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“…It is generally known that PAHs are not oxidized readily under mild conditions. Several stringent chemical decomposition methods have been reported for this purpose, for example (with respect to anthracene oxidation), photocatalytic,3a–f photo‐electrochemical,3g and sono‐electrochemical oxidation,3f Fenton reagent coupled biodegradation,4a–d electro‐enzymatic oxidation,5a–d gamma‐ray irradiation,6 the ozonization reaction,7a,b high‐temperature vapor‐phase oxidation on a catalytic surface (≈300 °C),8a,b and liquid‐phase catalytic chemical oxidation at approximately 90 °C 9a,b. Electrochemical oxidation of PAHs has rarely been achieved because of their particularly unreactive character.…”

Section: Methodsmentioning

confidence: 99%

Facile Electrochemical Oxidation of Polyaromatic Hydrocarbons to Surface‐Confined Redox‐Active Quinone Species on a Multiwalled Carbon Nanotube Surface

Barathi

Kumar

2013

Chemistry A European J

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Polyaromatic hydrocarbon (PAH) oxidation: PAHs, which are considered major environmental pollutants, are carcinogenic, and cannot be electrochemically oxidized on conventional electrodes (gold, platinum, and glassy carbon), can be electrochemically oxidized on multiwalled carbon nanotube surfaces at a potential of 1 V versus Ag/AgCl at pH 7. This results in the formation of stable surface-confined quinone systems (see scheme; AN = anthracene; AQ = anthraquinone).

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“…AQ is industrially synthesized from naphthalene or ANT. The synthesis from naphthalene is performed via oxidation of naphthalene using catalysts such as vanadium oxides and subsequent Diels–Alder reaction of the resulting naphthoquinone, followed by the oxidation of the obtained tetrahydronaphthoquinone. , The oxidation of ANT also uses vanadium oxide catalysts to synthesize AQ. , Both routes require metal catalysts, and the resulting AQ must be finally purified. On the other hand, although all of ANT was not completely oxidized and utilized in the present study, AC/ANT-Ox shows superior electrode performance to AC/AQ despite the fact that AC/AQ was prepared using AC and AQ.…”

Section: Resultsmentioning

confidence: 99%

“…42,43 The oxidation of ANT also uses vanadium oxide catalysts to synthesize AQ. 44,45 Both routes require metal catalysts, and the resulting AQ must be finally purified. On the other hand, although all of ANT was not completely oxidized and utilized in the present study, AC/ANT-Ox shows superior electrode performance to AC/AQ despite the fact that AC/AQ was prepared using AC and AQ.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Electrochemical Oxidation of Anthracene to Anthraquinone inside the Nanopores of Activated Carbon: Implications for Electrochemical Capacitors

Itoi

Takagi

Usami

et al. 2023

ACS Appl. Nano Mater.

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Anthracene (ANT) is oxidized to anthraquinone (AQ) inside the nanopores of activated carbon (AC) without any metal catalysts. The resulting hybrid of AC and AQ shows high performance as an anode for aqueous electrochemical capacitors due to the reversible redox reaction of AQ inside the nanopores of AC. ANT is first adsorbed inside the nanopores of AC in the gas phase and finely dispersed at the nanolevel. Consequently, the adsorbed ANT has a large contact area with the conductive carbon pore surface. The adsorbed ANT is then electrochemically oxidized to AQ in aqueous H 2 SO 4 electrolyte. The oxidation of ANT requires conductive surfaces for charge transfer, and ANT is efficiently oxidized at the large contact interface between the conductive carbon pore surface and ANT by using AC. The hybrid is capable of fast charging and discharging through rapid charge transfer at the large contact interface. In addition, since the hybridization of AQ inside the AC pores does not expand the volume of AC particles, the volumetric capacitance is enhanced by the hybridization. Furthermore, the nanopores of AC prevent AQ from desorbing into the electrolyte during charging and discharging. Consequently, the hybridization endows the hybrid with a high volumetric capacitance, a high rate capability, and a long cycle lifetime. We demonstrate that nanopores can provide the reaction environment not only for efficient oxidation of ANT as nanoreactors but also for a fast redox reaction of AQ.

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Mechanism of Vapor-Phase Oxidation of Anthracene over Vanadium Pentoxide Catalyst

Abstract: reaction rates respectively for total disappearance of n-pentane, hydrocracking, and isomerization,

Cited by 9 publications

References 0 publications

Synergistic Elimination of NO_x and Chloroaromatics on a Commercial V₂O₅–WO₃/TiO₂ Catalyst: Byproduct Analyses and the SO₂ Effect

Synergistic Elimination of NO_x and Chloroaromatics on a Commercial V₂O₅–WO₃/TiO₂ Catalyst: Byproduct Analyses and the SO₂ Effect

Facile Electrochemical Oxidation of Polyaromatic Hydrocarbons to Surface‐Confined Redox‐Active Quinone Species on a Multiwalled Carbon Nanotube Surface

Electrochemical Oxidation of Anthracene to Anthraquinone inside the Nanopores of Activated Carbon: Implications for Electrochemical Capacitors

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Mechanism of Vapor-Phase Oxidation of Anthracene over Vanadium Pentoxide Catalyst

Abstract: reaction rates respectively for total disappearance of n-pentane, hydrocracking, and isomerization,

Cited by 9 publications

References 0 publications

Synergistic Elimination of NOx and Chloroaromatics on a Commercial V2O5–WO3/TiO2 Catalyst: Byproduct Analyses and the SO2 Effect

Synergistic Elimination of NOx and Chloroaromatics on a Commercial V2O5–WO3/TiO2 Catalyst: Byproduct Analyses and the SO2 Effect

Facile Electrochemical Oxidation of Polyaromatic Hydrocarbons to Surface‐Confined Redox‐Active Quinone Species on a Multiwalled Carbon Nanotube Surface

Electrochemical Oxidation of Anthracene to Anthraquinone inside the Nanopores of Activated Carbon: Implications for Electrochemical Capacitors

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Synergistic Elimination of NO_x and Chloroaromatics on a Commercial V₂O₅–WO₃/TiO₂ Catalyst: Byproduct Analyses and the SO₂ Effect

Synergistic Elimination of NO_x and Chloroaromatics on a Commercial V₂O₅–WO₃/TiO₂ Catalyst: Byproduct Analyses and the SO₂ Effect