Mechanism of catalytic degradation of 2,4,6-trichlorophenol by a Fe-porphyrin catalyst

[Display omitted] ▶ Efficient catalytic oxidation of TCP was achieved by a Fe-porphyrin catalyst. ▶ Initial oxidation products were DCQ and Cl ions. ▶ Final oxidation products were five chlorinated dimmers produced via radical polymerization. ▶ Homogeneous [FeR4P] is more efficient vs. the heterogen...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2011-01, Vol.101 (3-4), p.417-424
Main Authors: Christoforidis, Konstantinos C., Serestatidou, Eleni, Louloudi, Maria, Konstantinou, Ioannis K., Milaeva, Elena R., Deligiannakis, Yiannis
Format: Article
Language:English
Subjects:
Byproducts
Catalysis
Catalysts
Catalytic mechanism
Chlorophenol
DCQ
Dechlorination
Dehalogenation
EPR
Heme catalyst
Heterogeneous catalyst
Iron
LC–MS
Mathematical analysis
Oxidation
Oxidation products
Radical
Spectroscopy
TCP
TCP (protocol)
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Summary:[Display omitted] ▶ Efficient catalytic oxidation of TCP was achieved by a Fe-porphyrin catalyst. ▶ Initial oxidation products were DCQ and Cl ions. ▶ Final oxidation products were five chlorinated dimmers produced via radical polymerization. ▶ Homogeneous [FeR4P] is more efficient vs. the heterogenized (FeR4P–SiO4) catalyst. ▶ A complete catalytic mechanism is proposed. The catalytic oxidation of 2,4,6-trichlorophenol (TCP) by a homogeneous Fe-porphyrin catalyst (FeR4P) and the corresponding heterogeneous one (immobilized on silica, FeR4P–SiO2) was studied by analytical and EPR spectroscopic methods. The homogeneous catalyst was found to be more efficient for oxidative decomposition and dechlorination of TCP, compared to the heterogeneous FeR4P–SiO2 catalyst. The main, initial and final, oxidation products were identified and a general catalytic mechanism was proposed concerning TCP oxidation and the by-products formation, in relation with the catalyst's redox cycle.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2010.10.011