The use of active carbon pretreated at 2173 K as a support for palladium catalysts for hydrodechlorination reactions

Magdalena Bonarowska , Wioletta Raróg-Pilecka , Zbigniew Karpiński

Abstract

A commercial active carbon was heat-treated at 2173 K in argon and then subjected to steam gasification, yielding a series of very pure, turbostratic carbon materials, characterized by different specific surface areas and pore volume. These materials served as supports for palladium catalysts. Their pore structure, apparent absence of oxygen containing functional groups and hydrophobic character have a great effect on the dispersion of palladium introduced by impregnation. The use of an acetone solution of palladium acetate rather than an aqueous solution of palladium chloride (a typical Pd precursor) for the impregnation gives better results for preparing more metal dispersed Pd/C catalysts, especially for carbons with smaller micropore volumes. All preheated carbon-supported palladium catalysts showed very good activity and selectivity to CH2F2 in CCl2F2 (CFC-12) hydrodechlorination, up to 90\% at the highest reaction temperature. In contrast, untreated or only HCl-washed carbons showed inferior catalytic properties. Residual phosphorus in the active carbons which were present in the active carbons which have not been subjected to thermal treatment, appears to be responsible for deterioration of catalytic properties of Pd/C. After reaction the presence of interstitial carbon (originating from the CFC-12 molecule) in the Pd lattice was found in the catalysts characterized by lower and medium metal dispersions.
Author Magdalena Bonarowska - [Institute of Physical Chemistry of the Polish Academy of Sciences]
Magdalena Bonarowska,,
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, Wioletta Raróg-Pilecka (FC / DITC)
Wioletta Raróg-Pilecka,,
- Department Of Inorganic Technology And Ceramics
, Zbigniew Karpiński - [Institute of Physical Chemistry of the Polish Academy of Sciences]
Zbigniew Karpiński,,
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Journal seriesCatalysis Today, ISSN 0920-5861, (A 40 pkt)
Issue year2011
Vol169
No1
Pages223-231
Keywords in EnglishCarbon gasification, Carbon-supported Pd catalysts, CF2Cl2, Hydrodechlorination, Pore structure, Turbostratic carbons
ASJC Classification1600 General Chemistry; 1503 Catalysis
DOIDOI:10.1016/j.cattod.2010.12.039
URL http://www.sciencedirect.com/science/article/pii/S0920586110008862
Score (nominal)40
Score sourcejournalList
Publication indicators WoS Citations = 12; Scopus Citations = 14; GS Citations = 3.0; Scopus SNIP (Source Normalised Impact per Paper): 2011 = 1.56; WoS Impact Factor: 2011 = 3.407 (2) - 2011=3.584 (5)
Citation count*3 (2015-02-02)
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