Supported and mixed oxide catalysts based on iron and titanium for the oxidative decomposition of chlorobenzene

Khaleel, Abbas; Al-Nayli, Aysha

doi:10.1016/j.apcatb.2007.11.027

Cited by 69 publications

(31 citation statements)

References 18 publications

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“…30,39 Similar oxidative degradation routes have been reported for the detection of phenolate compounds during the degradation of HCB over Al 2 O 3 29 and the degradation of chlorobenzene over iron and titanium oxide catalysts. 40 First, dissociative adsorption of CN-75 on the central iron cations occurs, followed by the attack of carbon atom potential to accepting the electrons by reactive nucleophilic oxygen O 2− species. This results in C−Cl bond cleavage and subsequent Fe−Cl bond formation, and the generation of naphthol species as partial oxidation products.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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: 99%

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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“…It has been reported that the sol-gel technique reveals much higher ability in this aspect and the preparation of stable monocomponent titanium [31]-or iron [26,27]-modified MCM-41 materials has been achieved. Recently, high catalytic activity of mixed iron and titanium oxide bulk materials in oxidative decomposition of chlorobenzene has been reported [32]. Catalytic oxidation of aromatics are in main importance because they are emitted from diverse sources, e.g.…”

Section: Introductionmentioning

confidence: 99%

Toluene oxidation on titanium- and iron-modified MCM-41 materials

Popova

Szegedi

Cherkezova‐Zheleva

et al. 2009

Journal of Hazardous Materials

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“…Catalysis techniques is usually employed to achieve low temperature dechlorination of organochlorine, the catalytic behavior of CaO, MgO, Fe 2 O 3 , V 2 O 5 , Co 3 O 4 , and other couple oxide composites has been investigated (Koper and Klabunde, 1997;Mishakov et al, 2002;Weber et al, 2002; Lomnicki * Corresponding author. E-mail: zpinghao@rcees.ac.cn and Dellinger, 2003;Matsuda et al, 2009;Khaleel and Nayli, 2008). A few studies reported that DDT could be completely dechlorinated over Pt/Pd catalysts, Mg/Pd and Fe/Pd bimetallic composites (Monguchi et al, 2006;Ukisu, 2008;Engelmann et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Study of DDT and its derivatives DDD, DDE adsorption and degradation over Fe-SBA-15 at low temperature

Wang

Tian

Hao

2012

Journal of Environmental Sciences

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Mesoporous SBA-15 with different Fe 2 O 3 loading were synthesized by an in-situ coating progress for removals of dichlorodiphenyltrichloroethane (DDT) and its derivatives, i.e., 1,1-dichloro-2,2-bis-(p-chlorophenyl)ethane (DDD) and 1,1-dichloro-2,2-bis-(4-chloro -phenyl) ethane (DDE). The results from XRD (X-ray diffractometer), TEM (transmission electron microscopy) indicated that the iron could be well dispersed on SBA-15 within 6 wt.% Fe 2 O 3 loading. Nitrogen adsorption-desorption tests indicated that the synthesized materials were characterized by ordered meso-structure, high surface area and large pore volume. DDTs were removed from aqueous media in 12-hr treatment and high removal efficiency of DDTs was achieved at over 94%. DDTs could be completely degraded at 350°C under the existence of SBA-15 with 4 wt.% Fe 2 O 3 loading. The final degradation products of DDT were dichlorobenzophenone (DCB) and bis-(4-chloro-phenyl) methane (DDM), suggesting a complete dechlorination from trichloromethyl.

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Supported and mixed oxide catalysts based on iron and titanium for the oxidative decomposition of chlorobenzene

Cited by 69 publications

References 18 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

Toluene oxidation on titanium- and iron-modified MCM-41 materials

Study of DDT and its derivatives DDD, DDE adsorption and degradation over Fe-SBA-15 at low temperature

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Supported and mixed oxide catalysts based on iron and titanium for the oxidative decomposition of chlorobenzene

Cited by 69 publications

References 18 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

Toluene oxidation on titanium- and iron-modified MCM-41 materials

Study of DDT and its derivatives DDD, DDE adsorption and degradation over Fe-SBA-15 at low temperature

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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