Bulletin of the Korean Chemical Society

  • 제28권4호
  • /
  • Pages.529-532
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  • 2007
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  • 0253-2964(pISSN)
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  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Combined FTIR and Temperature Programmed Fischer-Tropsch Synthesis over Ru/SiO2 and Ru-Ag/SiO2 Supported Catalysts

  • Hussain, Syed T. (Department of Chemistry, Quaid-i-Azam University) ;
  • Nadeem, M. Arif (Department of Chemistry, Quaid-i-Azam University) ;
  • Mazhar, M. (Department of Chemistry, Quaid-i-Azam University) ;
  • Larachi, Faical (Department of Chemical Engineering, University of Laval)
  • 발행 : 2007.04.20
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초록

Combined temperature programmed reaction (TPR) and infrared (IR) spectroscopic studies for Fischer- Tropsch reaction have been performed over Ru/SiO2 and Ru-Ag/SiO2 supported catalysts. Reaction of linearly absorbed CO with hydrogen starts at 375 K over Ru/SiO2 catalyst and reaches maximum at 420 K accompanied with an intensity decrease of linear CO absorption. The reaction with bridged absorbed CO peaks around 510-535 K. Addition of Ag yields mixed Ru-Ag bimetallic sites while it suppresses the formation of bridged bonded CO. Formation of methane on this modified surface occurs at 390 K and reaches maximum at 444 K. Suppression of hydrogen on the Ag-doped surface also occurs resulting in the formation of unsaturated hydrocarbons and of CHx intermediates not observed with Ru/SiO2 catalyst. Such intermediates are believed to be the building blocks of higher hydrocarbons during the Fischer-Tropsch synthesis. Linearly absorbed CO is found to be more reactive as compared to bridged CO. The Ag-modified surface also produces CO2 and carbon. On this surface, hydrogenation of CO begins at 390 K and reaches maximum at 494 K. The high temperature for hydrogenation of absorbed CO and C over Ru-Ag/SiO2 catalyst as compared to Ru/SiO2 catalyst is due to the formation of Ru-Ag bimetallic surfaces impeding hydrogen adsorption.

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피인용 문헌

  1. Silicon–nickel intermetallic compounds supported on silica as a highly efficient catalyst for CO methanation vol.4, pp.1, 2014, https://doi.org/10.1039/C3CY00743J
  2. Catalytic Effects and Characteristics of Ni-based Catalysts Supported on TiO2-SiO2 Xerogel vol.28, pp.12, 2007, https://doi.org/10.5012/bkcs.2007.28.12.2288