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Water-promoted catalytic hydrodechlorination of transformer oil-contained PCBs in liquid system under mild conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
45396 46410 2014 8 PDF Available
Title
Water-promoted catalytic hydrodechlorination of transformer oil-contained PCBs in liquid system under mild conditions
Abstract

•The solvent system influences the activity and stability of catalysts in HDC reaction.•The mechanism of this phenomenon is investigated by characterization analyses.•A promising catalytic HDC solvent system of isopropanol–water (60/40, v/v) is developed.•This solvent system is applicable to the complete HDC of high concentration PCBs with Pd/C catalyst.•The Pd/C catalyst could be recovered and reused at least 10 times.

The influences of solvent system on the hydrodechlorination (HDC) of transformer oil-contained PCBs with H2 over Pd/C catalyst were studied. The addition of water in solvent system significantly accelerated the HDC reaction, which suggested its critical role for enabling Pd/C catalyst to keep high activity and stability. The mechanism of this phenomenon was studied through catalyst characterization (TEM, XRD and XPS), and the change of surface composition of Pd/C catalyst in different solvent in the HDC reaction was raveled. Above results indicated that water in isopropanol–water prevented NaCl accumulating on the surface of catalyst, which avoided the decline in activity and stability of the catalyst. On the basis of these studies, isopropanol–water (60/40, v/v) solvent system was developed to dispose high concentration transformer oil-contained PCBs, where the chloride atom removal ratio of transformer oil-contained PCBs at 2% (w/w) and 5% (w/w) concentration could reach 95.2% and 88.0% for 10 h under mild conditions respectively, and the Pd/C could be recovered and reused at least 10 times without any loss of catalytic activity.

Graphical abstractThe change of surface composition of 5% Pd/C(0) in isopropanol and isopropanol–water in the HDC of transformer oil-contained PCBs.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Transformer oil-contained PCBs; Pd/C; Hydrodechlorination (HDC); Characterization
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Water-promoted catalytic hydrodechlorination of transformer oil-contained PCBs in liquid system under mild conditions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 144, January 2014, Pages 580–587
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us