Journal
APPLIED SURFACE SCIENCE
Volume 376, Issue -, Pages 113-120Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2016.03.101
Keywords
Liquid phase catalytic hydrodebromination; Tetrabromobisphenol A; Supported Pd catalysts
Categories
Funding
- National Key Basic Research Program of China [2014CB441103]
- National Natural Science Foundation of China [21277069, 21277066, 21407074]
- National Natural Science Foundation of Jiangsu [BK20140598]
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Tetrabromobisphenol A (TBBPA) is a widely used brominated flame retardant and reductive debromination is an effective method for the abatement of TBBPA pollution. In this study, Pd catalysts supported on TiO2, CeO2, Al2O3 and SiO2 were prepared by the impregnation (the resulting catalyst denoted as im-Pd/support), deposition-precipitation (the resulting catalyst denoted as dp-Pd/support), and photo deposition (the resulting catalyst denoted as pd-Pd/support) methods. The catalysts were characterized by N-2 adsorption-desorption isotherm, X-ray diffraction, transmission electron microscopy, measurement of zeta potential, CO chemisorption, and X-ray photoelectron spectroscopy. The results showed that at an identical Pd loading amount (2.0 wt.%) Pd particle size in dp-Pd/TiO2 was much smaller than those in im-Pd/TiO2 and pd-Pd/TiO2. Pd particle size of the dp-Pd/TiO2 catalyst increased with Pd loading amount. Additionally, Pd particles in the dp-Pd/TiO2 catalysts were positively charged due to the strong metal support interaction, whereas the cationization effect was gradually attenuated with the increase of Pd loading amount. For the liquid phase catalytic hydrodebromination (HDB) of TBBPA, tri-bromobisphenol A (tri-BBPA), di-bromobisphenol A (di-BBPA), and mono-bromobisphenol A (mono-BBPA) were identified as the intermediate products, indicative of a stepwise debromination process. The catalytic HDB of TBBPA followed the Langmuir-Hinshelwood model, reflecting an adsorption enhanced catalysis mechanism. At an identical Pd loading amount, the Pd catalyst supported on TiO2 exhibited a much higher catalytic activity than those on other supports. Furthermore, dp-Pd/TiO2 was found to be more active than itn-Pd/TiO2 and pd-Pd/TiO2. (C) 2016 Elsevier B.V. All rights reserved.
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