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Gas-phase hydrodechlorination of trichloroethylene over Pd/NiMgAl mixed oxide catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
46373 46438 2012 10 PDF Available
Title
Gas-phase hydrodechlorination of trichloroethylene over Pd/NiMgAl mixed oxide catalysts
Abstract

Hydrotalcite derived NiMgAl mixed oxide (NiHT) catalysts with different NiMgAl molar ratio were synthesized and tested in the selective gas-phase hydrodechlorination of trichloroethylene to ethylene. The mixed oxide was further promoted by Pd in order to obtain Pd/NiHT catalysts. The catalysts performances for hydrodechlorination of trichloroethylene depend on the Ni/Mg/Al molar ratio, reduction temperature, and method of noble metal incorporation. The main products obtained were ethylene, methane, ethane, chloroethylene and traces of dichloroethylene. The higher the Ni amount in the NiHT support was, the higher were the catalytic activity and ethylene selectivity. Introduction of Pd increases the catalytic activity. Application of higher reduction temperatures improved the selectivity towards ethylene formation due to an increase in the concentration of surface metallic Ni. A better Pd-Ni surface interaction was obtained by impregnation of Pd on a previously reduced (823 K) NiHT catalyst, resulting in higher ethylene selectivity (80%). The higher selectivity was associated to metallic Ni promoted by a Pd-Ni alloy, which was detected by HRTEM.

Graphical abstract.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Pd/NiMgAl mixed oxides with different compositions synthesized from hydrotalcites. ► Used for selective gas-phase hydrodechlorination of trichloroethylene to ethylene. ► Performance depends on Ni/Mg/Al ratio, reduction temperature and preparation route. ► Better selectivity with more surface metallic Ni upon high temperature reduction. ► For Pd on pre-reduced NiMgAl Ni metal promoted by Pd-Ni alloy was detected by HRTEM.

Keywords
Hydrodechlorination; Trichloroethylene; Pd; NiMgAl mixed oxides; Ni Hydrotalcite
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Gas-phase hydrodechlorination of trichloroethylene over Pd/NiMgAl mixed oxide catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 117–118, 18 May 2012, Pages 236–245
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
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Any Questions? feel free to contact us