Selective Liquid-phase Hydrodechlorination of Chlorotrifluoroethylene over Palladium-Supported Catalysts: Activity and Deactivation

Liquid-phase hydrodechlorination of chlorotrifluoroethylene (CTFE) to trifluoroethylene (TrFE) with molecular hydrogen was studied over palladium-supported catalysts. BaSO₄, Al₂O₃ and activated carbon (AC) were used as supports, respectively. The results showed that the Pd/AC catalysts exhibit highe...

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Bibliographic Details
Published in:Catalysis letters 2010-08, Vol.138 (1-2), p.68-75
Main Authors: Meng, Bao-Chuan, Sun, Zhao-Yang, Ma, Jin-Peng, Cao, Gui-Ping, Yuan, Wei-Kang
Format: Article
Language:English
Subjects:
Activated carbon
Adsorbents
Aluminum oxide
Barite
Barium sulfate
Catalysis
Catalysts
Catalytic activity
Chemistry
Chemistry and Materials Science
Chlorotrifluoroethylene
Colloidal state and disperse state
Deactivation
Exact sciences and technology
Functional groups
General and physical chemistry
HNO₃ pretreatment
Hydrodechlorination
Hydrogen
Industrial Chemistry/Chemical Engineering
Leaching
Liquid phases
Organometallic Chemistry
Oxygen atoms
Palladium
Palladium catalysts
Pd/AC catalyst
Physical Chemistry
Porosity
Porous materials
Surface area
Surface physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Trifluoroethylene
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Summary:Liquid-phase hydrodechlorination of chlorotrifluoroethylene (CTFE) to trifluoroethylene (TrFE) with molecular hydrogen was studied over palladium-supported catalysts. BaSO₄, Al₂O₃ and activated carbon (AC) were used as supports, respectively. The results showed that the Pd/AC catalysts exhibit higher activity than Pd/BaSO₄ and Pd/Al₂O₃. The treatment of activated carbon with HNO₃ led to a considerable increase of surface functional groups containing oxygen atoms, which resulted in a higher dispersion of palladium on the supports and enhancement of catalytic activity. The stability of the catalyst was investigated, one reason for the inhibition was the accumulation of NaCl on the surface of Pd/AC that blocks the pores of carbon support. The activity of Pd/AC could partially recovered by washing with water. The other irreversible deactivation of the catalyst are from the change of particle size and the pore structure, leaching of Pd, a decrease of BET surface area and Pd surface area of Pd/AC catalyst. Graphical Abstract [graphic removed]
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-010-0370-8