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Improved γ-alumina-supported Pd and Rh catalysts for hydrodechlorination of chlorophenols

Paper ID Volume ID Publish Year Pages File Format Full-Text
39494 45825 2014 8 PDF Available
Title
Improved γ-alumina-supported Pd and Rh catalysts for hydrodechlorination of chlorophenols
Abstract

•Increasing the calcination temperature improves both the dechlorination and hydrogenation rates of Pd/γ-Al2O3.•The activity of Rh/γ-Al2O3 is not significantly affected by calcination and reduction temperatures.•The incorporation of Fe onto the catalysts allows development of magnetic properties.•The monometallic and bimetallic catalysts showed a high stability with negligible Pd or Rh leaching.

The activity of monometallic (Pd or Rh) and bimetallic (iron-bearing) catalysts has been tested in the HDC of 4-chlorophenol (4-CP) in aqueous phase. The catalysts were prepared by a simple procedure consisting of incipient wetness impregnation followed by calcination and reduction at different temperatures. This allowed controlling the size, dispersion and oxidation state of the metallic nanoparticles. Increasing the temperature of calcination led to a higher dispersion of the active phase (from 21 to 46% by increasing the calcination temperature from 200 to 400 °C) and a higher ratio of zerovalent to electrodefficient palladium (M0/Mn+ values from 1.15 to 2.17) in the case of the Pd-catalysts. Those calcined in air at 400 °C and reduced with H2 at 350 °C yielded the highest values of the pseudo-first-order rate constant of 4-CP dechlorination (16.2 L h−1 gcat−1). The introduction of iron reduced the metal dispersion of both Pd and Rh but the catalysts maintained their dechlorination activity and showed magnetic properties useful for further separation from the liquid phase.

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Keywords
Catalytic hydrodechlorination; 4-Chlorophenol; Pd and Rh catalysts; Magnetic catalysts.
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Improved γ-alumina-supported Pd and Rh catalysts for hydrodechlorination of chlorophenols
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 488, November 2014, Pages 78–85
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