Catalytic oxidation of 1,2-dichlorobenzene over CaCO3/α-Fe2O3 nanocomposite catalysts

Ma, Xiaodong; Sun, Quan; Feng, Xin; He, Xuan; Guo, Jie; Sun, Hongwen; Cao, Huiqin

doi:10.1016/j.apcata.2012.10.019

Cited by 84 publications

(51 citation statements)

References 36 publications

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“…This results in C−Cl bond cleavage and subsequent Fe−Cl bond formation, and the generation of naphthol species as partial oxidation products. 28,41 Following consumption of the nearby lattice oxygen O As observed in Figure 4b, the naphthalene ring is represented by the dark blue area that is indicative of a denser-electron distribution region when compared with other areas of CN-75. The electrophilic O 2 − and O − species with strong reactivity can attack the π electron cloud of naphthalene ring with highly dense electron population.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

Thermal Degradation of Octachloronaphthalene over As-Prepared Fe₃O₄ Micro/Nanomaterial and Its Hypothesized Mechanism

Lü

Zhang

et al. 2014

Environ. Sci. Technol.

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Decomposition of octachloronaphthalene (CN-75) featuring fully substituted chlorines was investigated over asprepared Fe 3 O 4 micro/nanomaterial at 300°C. It conforms to pseudo-first-order kinetics with k obs = 0.10 min −1 as comparable to that of hexachlorobenzene and decachlorobiphenyl. Analysis of the products indicates that the degradation of CN-75 proceeds via two competitive hydrodechlorination and oxidation pathways. The onset of hydrodechlorination producing lower chlorinated naphthalenes (CNs) is more favored on α-position than β-position. Higher amounts of CN-73, CN-66/67, CN-52/60, and CN-8/11 isomers were found, while small content difference was detected within the tetrachloronaphthalene and trichloronaphthalene homologues, which might be attributed to lower energy principle and steric effects. The important hydrodechlorination steps, leading to CN-73 ≫ CN-74 in two heptachloronaphthalene isomers contrary to that in technical PCN-mixtures, were specified by calculating the charge of natural bond orbitals in CN-75 and the energy of two heptachloronaphthalene radicals. On the basis of the molecular electrostatic potential of CN-75, the nucleophilic O 2− , and eletrophilic O 2 − and O − , present on the Fe 3 O 4 surface, might attack the carbon atom and π electron cloud of naphthalene ring, producing naphthol species with Mars−van Krevelen mechanism, and formic and acetic acids.

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Section: ■ Results and Discussionmentioning

confidence: 94%

Thermal Degradation of Octachloronaphthalene over As-Prepared Fe₃O₄ Micro/Nanomaterial and Its Hypothesized Mechanism

Lü

Zhang

et al. 2014

Environ. Sci. Technol.

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“…And the use of transition metal catalysts can lower the cost because most of them are less expensive. Thus, there are few reports about transition metals oxides used for catalytic combustion of o-DCB in recent years, including V2O5/TiO2-based catalyst [2,4], CaCO3/-Fe2O3 [14], Fe-Ca-Ox/TiO2 [8] catalysts, TiO2-masked Fe3O4 [15], Mn-modified Co3O4 [16] and so on. V2O5/TiO2 prepared by a sol-gel method showed a very high activity and thermal stability for gas phase oxidation of o-DCB, but V2O5 is toxic so as to cause secondary pollution.…”

Section: Introductionmentioning

confidence: 99%

Low temperature catalytic combustion of 1,2-dichlorobenzene over CeO2–TiO2 mixed oxide catalysts

Deng

Dai

Lao

et al. 2016

Applied Catalysis B: Environmental

178

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“…Alternatively, the application of various metal oxide catalyst into the degradation of persistent organic pollutants at relatively low temperatures caused much attention due to their high catalytic activity, thermal stability, low costs, and ease of preparation (Jia et al, 2010;Ma et al, 2014;Pitk€ aaho et al, 2013). Furthermore, the studies have revealed that the composite iron oxide catalysts exhibited better catalytic activity than single iron oxide, for the decomposition of halogenated compounds (Ma et al, 2005(Ma et al, , 2013. Nevertheless, to our knowledge, studies investigating the decomposition of PBDEs especially by composite metal oxides are rare, and the influence of material preparation conditions on the degradation pathway is unclear.…”

Section: Introductionmentioning

confidence: 99%

Thermal degradation of 2,2′,4,4′-tetrabromodiphenyl ether (BDE-47) over synthesized Fe–Al composite oxide

Yang

et al. 2016

Chemosphere

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h i g h l i g h t sFeeAl composite oxide materials for BDE-47 degradation were successfully synthesized. Component and morphology of material were controlled by concentration of urea. Distribution of hydrodebromination products are analyzed over different material. Morphology and component might affect degradation pathway. a r t i c l e i n f o a b s t r a c tA series of FeeAl composite oxides were synthesized by the hydrothermal method using different urea dosages and examined towards the degradation of 2,2 0 ,4,4 0 -tetrabromodiphenyl ether (BDE-47) at 300 C. The as-prepared oxides were characterized by field-emission scanning electron microscopy, X-ray diffraction and energy-dispersive X-ray spectroscopy. The morphology and composition of the prepared materials could be regulated by controlling the urea concentration. Interestingly, these properties influenced the nature and amount of the hydrodebromination products generated during the degradation of BDE-47. The degradation of BDE-47 over the composite oxide prepared at a urea dosage of 3 mmol generated BDE-17 as the major isomer product, followed by BDE-28/33, -30, and -32, among the tribromodiphenyl ethers (tri-BDEs). Regarding the dibromodiphenyl ethers (di-BDEs) produced, the amount of the isomers decreased in the order of BDE-8/11 > BDE-7 > BDE-15 > BDE-10. And the BDE-1 among monobromodiphenyl was determined. In contrast, over the composite oxides prepared at urea dosages greater than 3 mmol, BDE-28/33 gradually become the major isomer product instead of BDE-17 among tri-BDEs. The amount of the other di-BDEs isomer such as BDE-15 and -10 approach to be comparable to that BDE-8/11. However, regardless of the urea dosage, BDE-47 converted into BDE-75 via an isomerization reaction. Based on these intermediate products identification, a possible hydrodebromination mechanism of BDE-47 over FeeAl composite oxide was comprehensively traced.

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Catalytic oxidation of 1,2-dichlorobenzene over CaCO3/α-Fe2O3 nanocomposite catalysts

Cited by 84 publications

References 36 publications

Thermal Degradation of Octachloronaphthalene over As-Prepared Fe₃O₄ Micro/Nanomaterial and Its Hypothesized Mechanism

Thermal Degradation of Octachloronaphthalene over As-Prepared Fe₃O₄ Micro/Nanomaterial and Its Hypothesized Mechanism

Low temperature catalytic combustion of 1,2-dichlorobenzene over CeO2–TiO2 mixed oxide catalysts

Thermal degradation of 2,2′,4,4′-tetrabromodiphenyl ether (BDE-47) over synthesized Fe–Al composite oxide

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Catalytic oxidation of 1,2-dichlorobenzene over CaCO3/α-Fe2O3 nanocomposite catalysts

Cited by 84 publications

References 36 publications

Thermal Degradation of Octachloronaphthalene over As-Prepared Fe3O4 Micro/Nanomaterial and Its Hypothesized Mechanism

Thermal Degradation of Octachloronaphthalene over As-Prepared Fe3O4 Micro/Nanomaterial and Its Hypothesized Mechanism

Low temperature catalytic combustion of 1,2-dichlorobenzene over CeO2–TiO2 mixed oxide catalysts

Thermal degradation of 2,2′,4,4′-tetrabromodiphenyl ether (BDE-47) over synthesized Fe–Al composite oxide

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Thermal Degradation of Octachloronaphthalene over As-Prepared Fe₃O₄ Micro/Nanomaterial and Its Hypothesized Mechanism

Thermal Degradation of Octachloronaphthalene over As-Prepared Fe₃O₄ Micro/Nanomaterial and Its Hypothesized Mechanism