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Oxidation of perchloroethylene—Activity and selectivity of Pt, Pd, Rh, and V2O5 catalysts supported on Al2O3, Al2O3-TiO2 and Al2O3-CeO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
46692 46445 2012 10 PDF Available
Title
Oxidation of perchloroethylene—Activity and selectivity of Pt, Pd, Rh, and V2O5 catalysts supported on Al2O3, Al2O3-TiO2 and Al2O3-CeO2
Abstract

The total oxidation of perchloroethylene (PCE) over Pt, Pd, Rh and V2O5 metallic monolith catalysts supported on Al2O3 as well as CeO2 and TiO2-doped Al2O3 was examined. To ensure high HCl yields, the amount of water as a hydrogen source was optimized to be 1.5 wt-% by testing the effect of water content on PCE oxidation. Water not only enhanced the selectivity towards HCl formation but also improved the PCE oxidation to some extent.Both, the activity and selectivity of the catalysts were found to be related to the properties of the catalyst support; addition of TiO2 or CeO2 into Al2O3 enhanced catalysts’ efficiency regardless of the active phase. Pt, Pd and Rh catalysts showed high catalytic activity, PCE conversions ranging from 72% to 99%, and HCl yields from 59% up to 93% were observed. Both activity and selectivity of the Pt/Al2O3-CeO2 and Pd/Al2O3-CeO2 catalysts were superior to the other tested catalysts. The results show that over the oxidation of PCE, the redox properties of the catalyst and the amount of activated oxygen may play bigger role than the acidity. To confirm the suspected positive effect on the PCE oxidation coming from the bidispersed mesopores seen over ceria-doped catalysts needs further testing.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► H2O as a hydrogen source increasing the HCl yield was optimized to 1.5 wt-%. ► All supports were active, but also selectivity towards CO2, CO and HCl was seen. ► The introduction of TiO2 or CeO2 into Al2O3 made these catalysts superior. ► Redox properties and activated oxygen amount plays a big role in PCE oxidation. ► Pt/Al2O3-CeO2 showed highest activity and Pd/Al2O3-CeO2 was most HCl selective.

Keywords
Catalytic oxidation; Chlorinated volatile organic compounds; CVOC; Perchloroethylene; Tetrachloroethylene; Tetrachloroethene; Emission abatement
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Oxidation of perchloroethylene—Activity and selectivity of Pt, Pd, Rh, and V2O5 catalysts supported on Al2O3, Al2O3-TiO2 and Al2O3-CeO2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 113–114, 22 February 2012, Pages 150–159
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