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Molecules 2016, 21(12), 1620; doi:10.3390/molecules21121620

Hydrodechlorination of Tetrachloromethane over Palladium Catalysts Supported on Mixed MgF2-MgO Carriers

1
Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw 01-224, Poland
2
Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, Poznań 61-614, Poland
3
Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, Warsaw 00-664, Poland
4
Faculty of Mathematics and Natural Sciences, School of Science, Cardinal Stefan Wyszyński University, Wóycickiego 1/3, Warsaw 01-938, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Erhard Kemnitz
Received: 1 November 2016 / Revised: 18 November 2016 / Accepted: 22 November 2016 / Published: 25 November 2016
(This article belongs to the Special Issue Nano-sized Metal Fluorides: Novel Approaches to Lewis Acid Catalysts)
View Full-Text   |   Download PDF [4453 KB, uploaded 25 November 2016]   |  

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. View Full-Text
Keywords: CCl4 hydrodechlorination; palladium; MgF2; MgO; MgO-MgF2; supports; Lewis acidity CCl4 hydrodechlorination; palladium; MgF2; MgO; MgO-MgF2; supports; Lewis acidity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bonarowska, M.; Wojciechowska, M.; Zieliński, M.; Kiderys, A.; Zieliński, M.; Winiarek, P.; Karpiński, Z. Hydrodechlorination of Tetrachloromethane over Palladium Catalysts Supported on Mixed MgF2-MgO Carriers. Molecules 2016, 21, 1620.

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