Hydrodechlorination of tetrachloromethane over palladium catalysts supported on mixed MgF2-MgO carriers

Magdalena Bonarowska , Maria Wojciechowska , Maciej Zieliński , Angelika Kiderys , Michał Zieliński , Piotr Winiarek , Zbigniew Karpiński

Abstract

Pd/MgO, Pd/MgF2 and Pd/MgO-MgF2 catalysts were investigated in the reaction of CCl4 hydrodechlorination. All the catalysts deactivated in time on stream, but the degree of deactivation varied from catalyst to catalyst. The MgF2-supported palladium with relatively large metal particles appeared the best catalyst, characterized by good activity and selectivity to C2-C5 hydrocarbons. Investigation of post-reaction catalyst samples allowed to find several details associated with the working state of hydrodechlorination catalysts. The role of support acidity was quite complex. On the one hand, a definite, although not very high Lewis acidity of MgF2 is beneficial for shaping high activity of palladium catalysts. The MgO-MgF2 support characterized by stronger Lewis acidity than MgF2 contributes to very good catalytic activity for a relatively long reaction period (~5 h) but subsequent neutralization of stronger acid centers (by coking) eliminates them from the catalyst. On the other hand, the role of acidity evolution, which takes place when basic supports (like MgO) are chlorided during HdCl reactions, is difficult to assess because different events associated with distribution of chlorided support species, leading to partial or even full blocking of the surface of palladium, which plays the role of active component in HdCl reactions.
Author Magdalena Bonarowska
Magdalena Bonarowska,,
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, Maria Wojciechowska
Maria Wojciechowska,,
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, Maciej Zieliński
Maciej Zieliński,,
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, Angelika Kiderys
Angelika Kiderys,,
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, Michał Zieliński
Michał Zieliński,,
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, Piotr Winiarek KTCh
Piotr Winiarek,,
- Chair of Chemical Technology
, Zbigniew Karpiński
Zbigniew Karpiński,,
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Journal seriesMolecules, ISSN 1420-3049
Issue year2016
Vol21
No12
Pages1620-1636
Publication size in sheets0.8
Keywords in English CCl4 hydrodechlorination; palladium; MgF2; MgO; MgO-MgF2; supports; Lewis acidity
DOIDOI:10.3390/molecules21121620
URL http://www.mdpi.com/1420-3049/21/12/1620
Languageen angielski
File
Molecules 21 (2016) 1620-1636.pdf 4.35 MB
Score (nominal)30
ScoreMinisterial score = 30.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 30.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 2.861 (2) - 2016=2.988 (5)
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