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Hydrogen peroxide promoted wet air oxidation of phenol: influence of operating conditions and homogeneous metal catalysts

1999; Wiley; Volume: 74; Issue: 5 Linguagem: Inglês

10.1002/(sici)1097-4660(199905)74

1097-4660

Javier Rivas, Stan T. Kolaczkowski, Fernando J. Beltrán, David McLurgh,

Catalysis and Oxidation Reactions

Journal of Chemical Technology & BiotechnologyVolume 74, Issue 5 p. 390-398 Paper Hydrogen peroxide promoted wet air oxidation of phenol: influence of operating conditions and homogeneous metal catalysts F Javier Rivas, Corresponding Author F Javier Rivas [email protected] Department of Chemical Engineering, University of Bath, Bath, BA2 7AY, UKDpto de Ingenierıa Quimica y Energética, Facultad de Ciencias, UEX, 06071 Badajoz, Spain===Search for more papers by this authorStan T Kolaczkowski, Stan T Kolaczkowski Department of Chemical Engineering, University of Bath, Bath, BA2 7AY, UKSearch for more papers by this authorFernando J Beltran, Fernando J Beltran Departamento de Ingenieria Quimica y Energetica, Universidad de Extremadura, 06071 Badajoz, SpainSearch for more papers by this authorDavid B McLurgh, David B McLurgh Department of Chemical Engineering, University of Bath, Bath, BA2 7AY, UKSearch for more papers by this author F Javier Rivas, Corresponding Author F Javier Rivas [email protected] Department of Chemical Engineering, University of Bath, Bath, BA2 7AY, UKDpto de Ingenierıa Quimica y Energética, Facultad de Ciencias, UEX, 06071 Badajoz, Spain===Search for more papers by this authorStan T Kolaczkowski, Stan T Kolaczkowski Department of Chemical Engineering, University of Bath, Bath, BA2 7AY, UKSearch for more papers by this authorFernando J Beltran, Fernando J Beltran Departamento de Ingenieria Quimica y Energetica, Universidad de Extremadura, 06071 Badajoz, SpainSearch for more papers by this authorDavid B McLurgh, David B McLurgh Department of Chemical Engineering, University of Bath, Bath, BA2 7AY, UKSearch for more papers by this author First published: 20 May 1999 https://doi.org/10.1002/(SICI)1097-4660(199905)74:5 3.0.CO;2-GCitations: 51AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract The promoted wet air oxidation of phenol has been investigated through the addition of hydrogen peroxide as a source of free radicals. The reaction has been shown to proceed in two stages, an initial fast reaction associated with hydrogen peroxide consumption and a second slower step that occurs at a rate comparable with conventional wet air oxidation. An increase in temperature has a positive effect on both stages, while oxygen partial pressure only influences the second slower stage. The influence of pH on phenol oxidation is shown to be significant with the highest efficiency achieved at very alkaline conditions when phenol is completely dissociated. The catalytic activity of homogeneous metal salts was investigated in both the presence and absence of hydrogen peroxide. The combined addition of hydrogen peroxide and a bivalent metal (ie copper, cobalt or manganese) is shown to enhance the rate of phenol removal. However, in the absence of hydrogen peroxide only copper exhibited catalytic activity. Finally, a reaction mechanism involving different radical species has been proposed. From the experimental results the apparent activation energy (96.9 ± 3.5 kJ mol−1) and pre-exponential factor (1.6 ± 0.2 1010 s−1) were calculated for hydrogen peroxide decomposition into hydroxyl radicals. © 1999 Society of Chemical Industry REFERENCES 1Huang C P, Doug C and Tang Z, Advanced chemical oxidation: its present role and future in hazardous waste treatment. Waste Manag 13: 361–377 (1993). 2Beltran F J, Encinar J M and Garcia Araya J F, Ozonation of o-cresol in aqueous solutions. Wat Res 24: 1309–1316 (1990). 3Beltran F J, Gonzalez M and Rivas F J, Advanced oxidation of polynuclear aromatic hydrocarbons in natural waters. J Env Sci & Health. Part A. 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