fulltext.study @t Gmail

Oxidation of perchloroethylene—Activity and selectivity of Pt, Pd, Rh, and V2O5 catalysts supported on Al2O3, Al2O3–TiO2 and Al2O3–CeO2. Part 2

Paper ID Volume ID Publish Year Pages File Format Full-Text
46546 46441 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. Part 2
Abstract

Pt, Pd, Rh and V2O5 metallic monolith catalysts supported on Al2O3, Al2O3–CeO2 and Al2O3–TiO2 were examined in the oxidation of perchloroethylene (PCE). The H2-TPR experiments proved that the enhanced reducibility is the key feature of the catalyst in PCE oxidation: both the activity and the selectivity followed the orders of catalysts’ reducibility. The NH3-TPD measurements showed that the acidity is not the determining property of the catalyst in the PCE oxidation. After the 40.5 h stability test, no carbonaceous species were seen on the Pt/Al2O3–CeO2 catalyst's surface. Instead, some chlorine was detected on the surface which at this point did not alter the catalysts’ performance. During the oxidation strong correlation between the water concentration in the feed and the HCl yield was seen. In the absence of oxygen, i.e. during destructive adsorption, the presence of water had even more pronounced effect on the HCl formation and on the catalysts’ stability. The oxidation of PCE over the Pt/Al2O3 and Pt/Al2O3–CeO2 catalysts and in the presence of excess hydrogen proceeds via detaching the chlorine atoms before the breakage of the carbon–carbon double bond, and hence following the order of the lowest bond energy in each step.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights▸ The total acidity did not correlate with the oxidation activity of the catalysts. ▸ The enhanced reducibility was the key property of the catalyst in PCE oxidation. ▸ After 40.5 h in PCE oxidation the Pt/Al2O3–CeO2 catalyst proved to be stable. ▸ In destructive adsorption water enhanced the HCl yield and catalysts’ stability. ▸ PCE decomposed by detaching the chlorine atoms prior carbon–carbon bond breakage.

Keywords
Catalytic oxidation; Emission abatement; Chlorinated volatile organic compounds (CVOCs); PCE; Tetrachloroethylene; Reducibility; Acidity; Destructive adsorption
First Page Preview
Oxidation of perchloroethylene—Activity and selectivity of Pt, Pd, Rh, and V2O5 catalysts supported on Al2O3, Al2O3–TiO2 and Al2O3–CeO2. Part 2
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 126, 25 September 2012, Pages 215–224
Authors
, , , , ,
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