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Tytuł artykułu

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

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
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.
Wydawca

Rocznik
Tom
2
Numer
1
Opis fizyczny
Daty
otrzymano
2014-10-30
zaakceptowano
2014-12-01
online
2015-04-09
Twórcy
  • 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
Bibliografia
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  • [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.
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  • [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.
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_1515_recat-2015-0002
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