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http://dx.doi.org/10.5012/bkcs.2007.28.4.529

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)
Publication Information
Bulletin of the Korean Chemical Society / v.28, no.4, 2007 , pp. 529-532 More about this Journal
Abstract
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.
Keywords
Ru/silica; Ru-Ag/silica catalyst; Fischer-Tropsch reaction; In-situ infrared and TPR-MS characterization;
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