Ozone initiated dechlorination and degradation of trichlorophenol using Ce–Zr loaded metal oxides as catalysts

•Oxidative degradation of trichlorophenol with complete dechlorination with chlorine free products using ozonation.•Evidence of partial mineralization with scope for complete mineralization.•100% conversion of TCP with single oxidative pathway. Oxidative dechlorination and degradation of trichloroph...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2013-10, Vol.142-143, p.129-141
Main Authors: Maddila, Suresh, Dasireddy, Venkata D.B.C., Oseghe, Ekemena O., Jonnalagadda, Sreekanth B.
Format: Article
Language:English
Subjects:
Catalysis
Cerium–Zirconium oxide
Chemistry
Dihydroxyfumaric acid
Exact sciences and technology
General and physical chemistry
Ozone
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Titania
Trichlorophenol
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Summary:•Oxidative degradation of trichlorophenol with complete dechlorination with chlorine free products using ozonation.•Evidence of partial mineralization with scope for complete mineralization.•100% conversion of TCP with single oxidative pathway. Oxidative dechlorination and degradation of trichlorophenol (TCP) in aqueous system initiated by ozone and catalyzed by varied loadings of cerium–zirconium oxide on metal oxides supports namely; Al2O3, SiO2 and TiO2 was investigated. Catalyst materials were synthesized and characterized by using various surface characterization techniques including XRD, BET, TPD, ICP, SEM, TEM and FT-IR. XRD showed that cerium–zirconia exists as three different phases on the surface of the catalysts. SEM and SEM–EDX indicated that cerium–zirconia oxide is well dispersed on the surface of the TiO2 with compared to Al2O3 and SiO2 supports. TEM showed that particle size of Ce–Zr is in the range of 40–80nm. Catalyst testing was done as function of reaction time and pH in a semi batch reactor. The oxidation products formed in the reaction were characterized by IR, 1H NMR and LC–MS mass spectral data. Dihydroxyfumaric acid (DHFA) and oxalic acid (OA) were the main oxidation products. The product distribution was dependent on the acidic character of the catalysts. Among the catalysts tested, 2.5% Ce–Zr/SiO2 showed good activity with 100% conversion in 4h while others needed 5h.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2013.05.012