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Characterization and reactivity of Al2O3 supported Pd-Ni bimetallic catalysts for hydrodechlorination of chlorobenzene

Paper ID Volume ID Publish Year Pages File Format Full-Text
46477 46440 2012 8 PDF Available
Title
Characterization and reactivity of Al2O3 supported Pd-Ni bimetallic catalysts for hydrodechlorination of chlorobenzene
Abstract

A series of Al2O3 supported bimetallic Pd-Ni catalysts were prepared by deposition–precipitation method. The physico-chemical properties of the catalysts were evaluated by different characterization techniques such as temperature programmed reduction (TPR), temperature programmed desorption of H2 (TPD), X-ray photoelectron spectroscopy (XPS), Braunner–Emmet–Teller (BET) surface area and pulse CO chemisorption. The activities of bimetallic Pd-Ni/Al2O3 catalysts were evaluated for continuous fixed bed gas phase hydrodechlorination of chlorobenzene operating at 140 °C under atmospheric pressure. The activity profiles demonstrate that an exceptional activity and stability of Pd-Ni/Al2O3 catalysts is accomplished by judicial variation of Ni composition with respect to Pd, which had arrived at Pd and Ni in 0.5:0.5 (wt%) ratio, while high Ni loaded Pd-Ni catalysts exhibit poorer stability. The high activity and stability of optimal catalyst is invoked due to formation of very active Pd-Ni interfaces embedded with Pdδ+ species, whereas lower stability resulted in high Ni loaded catalysts is due to aggregation of Ni component on topical Pd surface. The activity of mono and bimetallic catalysts are well correlate with the characterization results.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Pd-Ni bimetallic catalysts with low Pd are highly active for hydrodechlorination. ► Variation of surface, structural and geometrical features related to Pd-Ni content. ► Hydrodechlorination activity depends on method of catalyst preparation. ► The catalysts are stable for the hydrodechlorination of chlorinated hydrocarbons.

Keywords
Bimetallic Pd-Ni catalysts; Alumina; Deposition–precipitation; Hydrodechlorination; Chlorobenzene
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Characterization and reactivity of Al2O3 supported Pd-Ni bimetallic catalysts for hydrodechlorination of chlorobenzene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 111–112, 12 January 2012, Pages 309–316
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