Condensation by-products in wet peroxide oxidation: Fouling or catalytic promotion? part I. evidences of an autocatalytic process
Entity
UAM. Departamento de Ingeniería QuímicaPublisher
M D P I AGDate
2019-06-01Citation
10.3390/catal9060516
Catalysts 9.5 (2019): 516
ISSN
2073-4344DOI
10.3390/catal9060516Funded by
This research was funded by the Spanish MINECO, through the project CTM-2016-76454-R and by the CM, through the project P2018/EMT-4341. M. Munoz thanks the Spanish MINECO for the Ramón y Cajal postdoctoral contract (RYC-2016-20648)Project
Comunidad de Madrid. P2018/EMT-4341; Gobierno de España. CTM-2016-76454-REditor's Version
https://doi.org/10.3390/catal9060516Subjects
Autocatalytic kinetics; Condensation by-products; Fouling; Wet air oxidation; Wet peroxide oxidation; QuímicaRights
© 2019 by the authors. Licensee MDPI, Basel, SwitzerlandAbstract
The present work is aimed at the understanding of the condensation by-products role in wet peroxide oxidation processes. This study has been carried out in absence of catalyst to isolate the (positive or negative) effect of the condensation by-products on the kinetics of the process, and in presence of oxygen, to enhance the oxidation performance. This process was denoted as oxygen-assisted wet peroxide oxidation (WPO-O2) and was applied to the treatment of phenol. First, the influence of the reaction operating conditions (i.e., temperature, pH0, initial phenol concentration, H2 O2 dose and O2 pressure) was evaluated. The initial phenol concentration and, overall, the H2 O2 dose, were identified as the most critical variables for the formation of condensation by-products and thus, for the oxidation performance. Afterwards, a flow reactor packed with inert quartz beads was used to facilitate the deposition of such species and thus, to evaluate their impact on the kinetics of the process. It was found that as the quartz beads were covered by condensation by-products along reaction, the disappearance rates of phenol, total organic carbon (TOC) and H2 O2 were increased. Consequently, an autocatalytic kinetic model, accounting for the catalytic role of the condensation by products, provides a well description of wet peroxide oxidation performance
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Google Scholar:Quintanilla Gómez, María Asunción
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Diaz de Tuesta, Jose L.
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Figueruelo, Cristina
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Munoz, Macarena
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Casas de Pedro, José Antonio
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