Catalytic hydrodehalogenation of the flame retardant tetrabromobisphenol A by alumina-supported Pd, Rh and Pt catalysts
Entity
UAM. Departamento de Ingeniería QuímicaPublisher
ElsevierDate
2022-03-15Citation
10.1016/j.ceja.2021.100212
Chemical Engineering Journal Advances 9 (2022): 100212
ISSN
2666-8211 (online)DOI
10.1016/j.ceja.2021.100212Project
Gobierno de España. PID2019-105079RB-I00Editor's Version
https://doi.org/10.1016/j.ceja.2021.100212Subjects
Dechlorination; 4-Chlorophenol; Catalyst; QuímicaRights
© 2021 The Author(s)
Esta obra está bajo una licencia de Creative Commons Reconocimiento-NoComercial-SinObraDerivada 4.0 Internacional.
Abstract
Tetrabromobisphenol A (TBBPA) is one of the most used BFRs, being characterized by a strong persistence and leading to negative effects on both the environment and human health. The aim of this work is to evaluate the feasibility of aqueous-phase catalytic hydrodehalogenation (HDH) for the fast and environmentally-friendly degradation of the brominated flame retardant TBBPA. Pd, Rh, and Pt on alumina commercial catalysts (1% wt.) were tested and reactions were performed under ambient operating conditions. TBBPA (1 mg L−1) was completely removed in short reaction times (< 5 min) using the Pd catalyst while longer reaction times were required in the case of Rh and Pt catalysts as active phase. Furthermore, although TBBPA suffered a strong adsorption on the catalyst surface, both adsorbed and free molecules reacted. Bromine balance was closed (> 95%) in 15 min using Pd/Al2O3. Nevertheless, employing Rh and Pt alumina-supported catalysts debromination of TBBPA increased progressively requiring much longer times and only 83% and 78% debromination yields were achieved after 2 h reaction, respectively. Bisphenol A (BPA), a well-known endocrine disruptor, was generated as reaction intermediate but it was further hydrogenated with both Pd and Rh catalysts, whereas it remained as reaction product with the Pt catalyst. A series reaction pathway considering both hydrodebromination and hydrogenation steps was proposed based on the obtained results. The experimental data obtained with the Pd/Al2O3 catalyst were successfully described by a pseudo-first order kinetic model, obtaining an apparent activation energy of 36 kJ mol−1. Notably, this catalyst showed a reasonable stability after three consecutive HDH runs
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Google Scholar:Nieto-Sandoval, Julia
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Sánchez, Raquel
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Muñoz García, Macarena
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Martínez de Pedro, Zahara
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Casas de Pedro, José Antonio
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