Design and Synthesis of Carbon Molecular Sieves for Separation and Catalysis

  • David S. Lafyatis
  • Ravi K. Mariwala
  • Eric E. Lowenthal
  • Henry C. Foley


The activities and selectivities of Pt/C, Fe/SiO2, Pt/CMS, Pt/C/CMS, and Fe/SiO2/CMS catalysts were compared for the competitive hydrogenation of propylene and isobutylene in a continuous flow reactor. The latter two materials are novel hybrid catalysts, and the Fe/SiO2/CMS is an inorganic oxide-modified carbon molecular sieve (IOM-CMS). The carbon molecular sieving catalysts provide reactant shape selectivity for propylene versus isobutylene hydrogenation, when compared to the nonsieving versions of the catalysts with the same active metal. A pure carbon molecular sieve was shown to be inactive for hydrogenation under the conditions of this study. The effective diffusivities of propylene and isobutylene in the CMS catalysts were determined at 21°C using the gravimetric method. The effective diffusivity of propylene was found to be two orders of magnitude higher than that for isobutylene. A simple ordering analysis based upon the Thiele modulus is sufficient to capture the essential features of the improved reactant shape selectivity provided by the CMS catalyst.


Effective Diffusivity Conversion Ratio Furfuryl Alcohol Propylene Conversion Microporous Material 
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Copyright information

© Springer Science+Business Media New York 1992

Authors and Affiliations

  • David S. Lafyatis
    • 1
  • Ravi K. Mariwala
    • 1
  • Eric E. Lowenthal
    • 1
  • Henry C. Foley
    • 1
  1. 1.University of DelawareUSA

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