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2015 | 2 | 1 |

Article title

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


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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.







Physical description


1 - 12 - 2014
30 - 10 - 2014
9 - 4 - 2015


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


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