Catalytic destruction of pentachlorobenzene in simulated flue gas by a V2O5–WO3/TiO2 catalyst

Xu, Zhenzhen; Deng, Shubo; Yang, Yang; Zhang, Tingting; Cao, Qing; Huang, Jun; Yu, Gang

doi:10.1016/j.chemosphere.2012.01.004

Cited by 54 publications

(22 citation statements)

References 37 publications

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“…The increase in PCDD/Fs destruction is induced because of the NO addition. NO can be oxidized to NO 2 which has higher oxidation power than O 2 and is able to assist O 2 in the reoxidation step of V 4þ O x to V 5þ O x , thus accelerates the oxidation cycle of catalyst (Bertinchamps et al, 2005;Xu et al, 2012), as depicted in Fig. 4 (PCDDs as an example).…”

Section: Effect Of No and Nh 3 Addition On Pcdd/fs Removalmentioning

confidence: 98%

Catalytic decomposition of gaseous PCDD/Fs over V2O5/TiO2-CNTs catalyst: Effect of NO and NH3 addition

Wang

Hung

et al. 2016

Chemosphere

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Section: Effect Of No and Nh 3 Addition On Pcdd/fs Removalmentioning

confidence: 98%

Catalytic decomposition of gaseous PCDD/Fs over V2O5/TiO2-CNTs catalyst: Effect of NO and NH3 addition

Wang

Hung

et al. 2016

Chemosphere

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“…Usually, V 2 O 5 is considered as active sites and presents the strongest destruction ability for organic pollutants compared to other transition metal oxidesincluding CrO x , CuO x , MnO x , etc. (Cho and Ihm, 2002 (Xu et al, 2012;Ji et al, 2013). In addition, CeO 2 is also frequently studied in the environmental catalysis as its high oxygen-storage capacity and facile redox cycle of Ce 4+ /Ce 3+ (Skårman et al, 2002;Zimmer et al, 2002;Dai et al, 2007).…”

Section: Effects Of Oxygen On Pcdd/fs Destructionmentioning

confidence: 99%

“…Therefore, oxygen presents a greater influence on the oxidation of PCDD/Fs instead of dechlorination. Usually, it can be proposed that the destruction of aromatic compounds may occur by three different reaction pathway (Xu et al, 2012): firstly, aromatic rings are oxidized or opened, and then resulting in the formation of non-aromatic acyclic intermediates by oxidation; secondly, low chlorinated aromatic is formed due to hydrodechlorination; finally, chlorine atoms are replaced by surface oxygen species, providing by active sites of catalyst. Therefore, oxygen present can accelerate the first and last step, and thus oxidize PCDD/Fs.…”

Section: Effects Of Oxygen On Pcdd/fs Destructionmentioning

confidence: 99%

Catalytic Decomposition of PCDD/Fs over Nano-TiO2 Based V2O5/CeO2 Catalyst at Low Temperature

Lin

et al. 2016

Aerosol Air Qual. Res.

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Catalytic decomposition of PCDD/Fs (Polychlorinated dibenzo-p-dioxins and furans) over nano-TiO 2 based V 2 O 5 /CeO 2 catalyst is investigated at 180°C based on a stable PCDD/Fs generating system. Step impregnation method is used to prepare the powder catalyst, and catalyst characterization is conducted by XRD and TPR. Effects of oxygen, water vapour and sulphur dioxide on PCDD/Fs destruction are studied in terms of destruction efficiency. Oxygen plays a positive role on PCDD/Fs destruction by accelerating the conversion of V3+ O x and Ce 4+ O x . The destruction efficiencies of PCDD/Fs increase from 67.6% to 77.8% with oxygen contents increasing from 11 vol.% to 21 vol.%. In the absence of oxygen, PCDD/Fs can still be destroyed with destruction efficiency of 33.7% due to the lattice oxygen atoms stored by V 2 O 5 and CeO 2 . Water vapour negatively affects the destruction of PCDD/Fs by competitive adsorption. On the other hand, negative destruction efficiencies of TCDD and TCDF are observed in the presence of water, and the values become lower with water vapour contents increasing. This result demonstrates water vapour facilitates the removal of Cl -present on the catalyst surface. SO 2 inhibits the activity of catalyst by poisoning active sites of catalyst. With SO 2 concentration increasing from 0 to 100 ppm, destruction efficiencies of PCDD/Fs significantly decrease from 67.6% to 51.9%. Finally, catalyst regeneration is also investigated at 180°C in the presence of oxygen. Most of PCDD/Fs residues in the catalyst will be destroyed, and catalyst is regenerated without PCDD/Fs contaminated.

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“…In addition, if surface sulfate species were linked to the vanadium sites, it was possible that the vanadium species were converted into new chemical forms such as VOSO 4 and deposited on the surface of catalyst . The vanadium sites, irreversibly deactivated by SO 2 , were considered as oxidizer of PCDD/Fs degradation . Thus, the flue gas desulfurization devices should be arranged before the catalyst unit when this catalyst applies in the municipal waste incinerators.…”

Section: Resultsmentioning

confidence: 94%

Low temperature oxidation of PCDD/Fs by TiO₂‐based V₂O₅/WO₃ catalyst

Ren

et al. 2016

Env Prog and Sustain Energy

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Catalytic oxidation of vapor phase PCDD/Fs (polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans) by V 2 O 5 -WO 3 /TiO 2 catalyst at low temperature (1808C) was studied. An innovative PCDD/Fs generating system was designed to supply stable gaseous PCDD/Fs steam with initial concentration of 5.60 ng I-TEQ Nm 23 . The effects of Gas Hourly Space Velocity (GHSV), water vapor content and sulphur-dioxide (SO 2 ) concentration on catalytic oxidation were investigated. The destruction efficiency (DE) reaches a maximum value of 76.4% with a GHSV value of 2000 h 21 .In the presence of water vapor, there are almost no changes for the RE values of PCDD/Fs. Water vapor negatively affects the destruction of PCDD/Fs. However, when 3 vol % of water vapor is introduced into the reaction system, even more PCDD/Fs are destroyed compared with the absence of water vapor. SO 2 can inhibit the destruction of PCDD/Fs by poisoning catalyst. With SO 2 concentration increasing from 0 to 250 ppm, DE value of PCDD/Fs significantly decreases from 68.6% to 38.8%.

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Catalytic destruction of pentachlorobenzene in simulated flue gas by a V2O5–WO3/TiO2 catalyst

Cited by 54 publications

References 37 publications

Catalytic decomposition of gaseous PCDD/Fs over V2O5/TiO2-CNTs catalyst: Effect of NO and NH3 addition

Catalytic decomposition of gaseous PCDD/Fs over V2O5/TiO2-CNTs catalyst: Effect of NO and NH3 addition

Catalytic Decomposition of PCDD/Fs over Nano-TiO2 Based V2O5/CeO2 Catalyst at Low Temperature

Low temperature oxidation of PCDD/Fs by TiO₂‐based V₂O₅/WO₃ catalyst

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Catalytic destruction of pentachlorobenzene in simulated flue gas by a V2O5–WO3/TiO2 catalyst

Cited by 54 publications

References 37 publications

Catalytic decomposition of gaseous PCDD/Fs over V2O5/TiO2-CNTs catalyst: Effect of NO and NH3 addition

Catalytic decomposition of gaseous PCDD/Fs over V2O5/TiO2-CNTs catalyst: Effect of NO and NH3 addition

Catalytic Decomposition of PCDD/Fs over Nano-TiO2 Based V2O5/CeO2 Catalyst at Low Temperature

Low temperature oxidation of PCDD/Fs by TiO2‐based V2O5/WO3 catalyst

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Low temperature oxidation of PCDD/Fs by TiO₂‐based V₂O₅/WO₃ catalyst