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Titolo:
Low temperature decomposition of PCB by TiO2-based V2O5/WO3 catalyst: evaluation of the relevance of PCDF formation and insights into the first step of oxidative destruction of chlorinated aromatics
Autore:
Weber, R; Sakurai, T;
Indirizzi:
Ishikawajima Harima Heavy Ind Co Ltd, Res Inst, Isogo Ku, Yokohama, Kanagawa 2358501, Japan Ishikawajima Harima Heavy Ind Co Ltd Yokohama Kanagawa Japan 2358501 apan
Titolo Testata:
APPLIED CATALYSIS B-ENVIRONMENTAL
fascicolo: 2, volume: 34, anno: 2001,
pagine: 113 - 127
SICI:
0926-3373(20011105)34:2<113:LTDOPB>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANSITION-METAL OXIDES; POLYCHLORINATED DIBENZOFURANS PCDFS; MUNICIPAL WASTE INCINERATION; IN-SITU FTIR; 1,2-DICHLOROBENZENE; HYDROCARBONS; BIPHENYLS; PYROLYSIS; REDUCTION; REMOVAL;
Keywords:
PCB; destruction; V2O5/WO3-TiO2; PCDF formation; TEQ; chlorine shift; hydrogen abstraction; chlorination;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Weber, R Ishikawajima Harima Heavy Ind Co Ltd, Res Inst, Isogo Ku, 1 Shin Nakahara Cho, Yokohama, Kanagawa 2358501, Japan Ishikawajima Harima Heavy Ind Co Ltd 1 Shin Nakahara Cho Yokohama Kanagawa Japan 2358501
Citazione:
R. Weber e T. Sakurai, "Low temperature decomposition of PCB by TiO2-based V2O5/WO3 catalyst: evaluation of the relevance of PCDF formation and insights into the first step of oxidative destruction of chlorinated aromatics", APP CATAL B, 34(2), 2001, pp. 113-127

Abstract

The reduction of polychlorinated biphenyls (PCB) emissions to the environment are contemporary issues of global efforts. Within this goal, the destruction of PCB is a challenge also for applied catalysis, in particular with respect to the destruction of PCB waste and the off-gas cleaning of incineration facilities. In this study, PCB were destroyed on a V2O5/WO3 supported titanium catalyst at low temperature in the range of 150-300 degreesC. At a space velocity of 5000 h(-1) more than 98% could be removed, Below 250 degreesC, the higher chlorinated PCB remained partly unchanged on the catalyst for several minutes. In contrast, the oxidation process lasted up to hours at a temperature of 150 degreesC. At around 200 degreesC and below a significant part of the PCB were oxidised to the more toxic polychlorinated dibenzofurans (PCDF). The PCDF remained mainly adsorbed on the catalyst. At 250 degreesC, no significant amount of PCDF were detected and at 300 degreesC no byproducts were found. The oxidation of selected individual PCB isomers and the isomer specific analysis of PCDF formed give an insight into the initial step of degradationof chlorinated aromatics on V2O5/WO3-TiO2 catalysts. The results indicatedthat hydrogen abstraction is the preferred step and an initial abstractionof chlorine is only a minor pathway. This suggests an electrophilic oxygentransfer during the destruction of PCB. During the destruction experiments, a slight chlorination of the non-degraded PCB occurred. On the other hand, no measurable dechlorination/hydrogenation was observed. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 11:48:49