Effect of silver on the catalytic
hydrodechlorination of tetrachloromethane over
silica-supported palladium-silver catalysts

• Authors: Magdalena Bonarowska , Zbigniew Kaszkur , Zbigniew Karpiński
• Languages of publication: EN

Abstracts

EN

Two silica-supported palladium based catalysts
characterized by overall metal loadings 10 wt.%, and
atomic Pd : Ag ratios of 100 : 0 and 70 : 30, were prepared
by incipient wetness impregnation, subjected to reduction
in hydrogen and characterized by XRD. It was found that
incipient wetness co-impregnation of silica resulted in the
formation of a catalyst characterized by relatively small
metal crystallites (~11 nm) and significant extent of Pd-Ag
alloying. The catalytic performance was investigated in
the hydrodechlorination of tetrachloromethane in the gas
phase. Silver addition to palladium in the co-impregnated
catalysts had very pronounced effect, vastly decreasing the
overall activity (conversion) and also the selectivity towards
hydrocarbons, propensity characteristic for the monometallic
palladium catalysts working in CCl4 hydrodechlorination
carried out in the gas phase. Instead, large amounts of C2HxCly
dimeric products were formed. These dimers are considered
as possible coke precursors. Post-reaction samples of both
catalysts contained large amount of carbon which entered
the Pd and Pd-Ag phases. This carbon can be easily removed
by treatment with hydrogen at 450ºC.

Keywords

EN

Tetrachloromethane; Hydrodechlorination; Palladium catalysts; Pd-Ag/SiO2; Effect of alloying; Cokeformation

• Publisher: De Gruyter Open
• Journal: Recyclable Catalysis
• Year: 2015
• Volume: 2
• Issue: 1

Dates

accepted

1 - 12 - 2014

received

30 - 10 - 2014

online

9 - 4 - 2015

Contributors

author

Magdalena Bonarowska

• Institute of
  Physical Chemistry of the Polish Academy of Sciences, ul. Kasprzaka
  44/52, PL-01224 Warszawa, Poland

author

Zbigniew Kaszkur

• Institute of
  Physical Chemistry of the Polish Academy of Sciences, ul. Kasprzaka
  44/52, PL-01224 Warszawa, Poland

author

Zbigniew Karpiński

• Institute of
  Physical Chemistry of the Polish Academy of Sciences, ul. Kasprzaka
  44/52, PL-01224 Warszawa, Poland
• Faculty of Mathematics and Natural Sciences-
  School of Science, Cardinal Stefan Wyszyński University in Warsaw,
  ul. Wóycickiego 1/3, PL-01938 Warszawa, Poland

References

• [1] Lokteva E.S., Simagina V.I., Golubina E.V., Stoyanova I.V.,Lunin V.V., Formation of C1–C5 Hydrocarbons from CCl4 in thePresence of Carbon-Supported Palladium Catalysts, KinetCatal., 2000, 41, 776-781.
• [2] Lokteva E.S., Lunin V.V., Golubina E.V., Simagina V.I., EgorovaM., Stoyanova I.V., Stud. Surf. Sci. Catal., C-C bond formationduring hydrodechlorination of CCl4 on Pd-containing catalysts,2000, 130, 1997-2002.
• [3] Dal Santo V., Dossi C., Recchia S., Colavita P.E., Vlaic G., PsaroR., Carbon tetrachloride hydrodechlorination with organometallics-based platinum and palladium catalysts on MgO, J. Mol.Catal. A: Chem., 2002, 182-183, 157-166.
• [4] Golubina E.V., Lokteva E.S., Lunin V.V., Turakulova A.O.,Simagina V.I., Stoyanova I.V., Modification of the supportedpalladium catalysts surface during hydrodechlorination ofcarbon tetrachloride, Appl. Catal. A: Gen., 2003, 241, 123-132.
• [5] Szczepaniak B., Góralski J., Grams J., Paryjczak T., Badanieaktywności katalizatorów Pd-TiO2 w reakcji wodoroodchlorowaniaCCI4, Przem. Chem. 2006, 85, 764-765.
• [6] Szczepaniak B., Góralski J., Grams J., Paryjczak T., Pol. J.Environ. Stud. 2006, 15, 161–164.
• [7] Grams J., Góralski J., Szczepaniak B., Time-of-flight secondaryion-mass spectrometry as a new technique for the investigationsof the deactivation process of hydrodechlorinationcatalysts, Russ. J. Phys. Chem. A, 2007, 81, 1515-1520.[WoS]
• [8] Góralski J., Federyaeva V.S., Vitkovskaya R.F., Szinkowska M.,Study of properties of Al2O3 and TiO2 supported palladiumcatalysts in reactions of tetrachloromethane hydrogenation,Russ. J. Appl. Chem., 2012, 85, 598-603.[WoS]
• [9] Prati L., Rossi M., Reductive catalytic dehalogenation of lightchlorocarbons Appl. Catal. B: Environ., 1999, 23, 135-142.
• [10] Heinrichs B., Delhez P., Schoebrechts J.-P., Pirard J.-P.,Palladium–Silver Sol-Gel Catalysts for Selective Hydrodechlorinationof 1,2-Dichloroethane into Ethylene, J. Catal., 1997,172, 322-335.
• [11] Lambert S., Heinrichs B., Brasseur A., Rulmont A., Pirard J.-P.,Determination of surface composition of alloy nanoparticlesand relationships with catalytic activity in Pd–Cu/SiO2 cogelledxerogel catalysts, Appl. Catal. A: Gen. 2004, 270, 201-208.
• [12] Lambert S., Ferauche F., Brasseur A., Pirard J.-P., HeinrichsB., Pd–Ag/SiO2 and Pd–Cu/SiO2 cogelled xerogel catalystsfor selective hydrodechlorination of 1,2-dichloroethane intoethylene, Catal. Today, 2005, 100, 283-289.
• [13] Job N., Heinrichs B., Ferauche F., Noville F., Marien J., PirardJ.-P., Hydrodechlorination of 1,2-dichloroethane on Pd–Agcatalysts supported on tailored texture carbon xerogels, Catal.Today, 2005, 102–103, 234–241.
• [14] Job N., Heinrichs B., Lambert S., Pirard J.-P., Colomer J.-F.,Vertruyen B., Marien J., Carbon xerogels as catalyst supports:Study of mass transfer, AIChE J., 2006, 52, 2663-2676.
• [15] Śrębowata A., Lisowski W., Sobczak J.W., Karpiński Z.,Hydrogen-assisted dechlorination of 1,2-dichloroethane onactive carbon supported palladium–copper catalysts, Catal.Today, 2011, 175, 576-584.
• [16] Bonarowska M., Kaszkur Z., Łomot D., Rawski M., KarpińskiZ., Effect of gold on catalytic behavior of palladium catalystsin hydrodechlorination of tetrachloromethane, Appl. Catal. B:Env., 2015, 162, 45-56.
• [17] Lu M., Sun J., Zhang D., Li M., Zhu J., Shan Y., Highly selectivehydrodechlorination of CCl4 into CHCl3 on Ag–Pd/carboncatalysts, Reac. Kinet. Mech. Cat., 2010, 100, 99-103.
• [18] Sainero L.M.G., Seoane X.L., Fierro J.L.G., Arcoya A.,Liquid-Phase Hydrodechlorination of CCl4 to CHCl3 on Pd/Carbon Catalysts: Nature and Role of Pd Active Species, J.Catal., 2002, 209, 279-288.
• [19] Sainero L.M.G., Seoane X.L., Arcoya A., Appl Catal B: Env.,Hydrodechlorination of carbon tetrachloride in the liquid phaseon a Pd/carbon catalyst: kinetic and mechanistic studies,2004, 53, 101-110.
• [20] Bonarowska M., Juszczyk W., Karpiński Z., Hydrodechlorinationof tetrachloromethane over silica-supported palladium-goldalloys, Pol. J. Chem. Technol., in press.[WoS]
• [21] Lin Y.S., Microporous and dense inorganic membranes: currentstatus and prospective, Sep. Purif. Technol., 2001, 25, 39–55.

Identifiers

DOI

10.1515/recat-2015-0002