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Design and Synthesis of Carbon Molecular Sieves for Separation and Catalysis

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

Abstract

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.

Keywords

Effective Diffusivity Conversion Ratio Furfuryl Alcohol Propylene Conversion Microporous Material 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Bragin, O. V., T. G. Olfereva, J. Ludwig, W. Fiebig, K. Heise, and K. H. Schnabel. 1980. Effect of the pore structure of the support on the catalytic properties of platinum-carbon molecular sieves. Z. Chem. 20: 387–388.CrossRefGoogle Scholar
  2. Chihara, K., M. Suzuki, and K. Kawazoe. 1978. Interpretation for the micropore diffusivities of gases in molecular sieving carbon. J. Colloid Interface Sci. 64: 584–587.CrossRefGoogle Scholar
  3. Conner, H. DE Patent 3006105, 1980.Google Scholar
  4. Dessau, R. M. U.S. Patent 441354, 1983.Google Scholar
  5. Dollimore, D., and G. R. Heal. 1964. An improved method for the calculation of pore size distribution from adsorption data. J. Applied Chem. 14: 109–114.CrossRefGoogle Scholar
  6. Dunlop, A. P. and F. N. Peters. 1942. The nature of furfuryl alcohol. Ind. Eng. Chem. 34: 814817.Google Scholar
  7. Foley, H. C. 1987. Novel Carbon Molecular Sieve Catalysts for Wax Suppression in the Fischer-Tropsch Reaction. Dept. of Energy Contract No. DE-AC22–84PC 70031, Final Report, June 1987.Google Scholar
  8. Foley, H. C. 1988. Carbon Molecular Sieves: Properties and Applications in Perspective. In Perspectives in Molecular Sieve Science, W. H. Flank and T.E. Whyte, Jr. (eds.), pp. 335–360. Washington, DC: American Chemical Society.CrossRefGoogle Scholar
  9. Gregg, S. J., and K. S. W. Sing. 1982. Adsorption, Surface Area and Porosity, 2nd ed. London: Academic Press.Google Scholar
  10. Grunewald, G. C., and R. S. Drago. 1990. Oxidative dehydrogenation of ethylbenzene to styrene over carbon-based catalysts. J. Mol. Catal. 58: 227–233.CrossRefGoogle Scholar
  11. Grunewald, G. C., and R. S. Drago. 1991. Carbon molecular sieves as catalysts and catalyst supports. J. Am. Chem. Soc. 113: 1636–1639.CrossRefGoogle Scholar
  12. Haag, W. O., and N. Y.Chen. 1987. Catalyst design with zeolites. In Catalyst Design, Progress and Perspectives, Hegedus, L.L. (ed.), pp. 163–212. New York: Wiley and Sons.Google Scholar
  13. Lafyatis, D. S., J. Tung, and H.C. Foley. 1991. Poly(furfuryl alcohol)-derived carbon molecular sieves: dependence of adsorptive properties on carbonization temperature, time, and poly(ethylene glycol) additives. Ind. Eng. Chem. Res. 30: 865–873.Google Scholar
  14. Lafyatis, D. S., and H. C. Foley. 1990. Molecular modelling of the shape selectivity for the Fischer-Tropsch reaction using a trifunctional catalyst. Chem. Eng. Sci. 45: 2567–2574.Google Scholar
  15. Lee, C. S. U.S. Patent 4,652, 690, 1987.Google Scholar
  16. Moreno-Castilla, C., O. P. Mahajan, P. L. Walker, Jr., H. J. Jung, and M. A. Vannice. 1980. Carbon as a support for catalysts-III. Carbon 18: 271–276.CrossRefGoogle Scholar
  17. Schmitt, Jr., J. L., and P. L. Walker, Jr. 1971. Carbon molecular sieve supports for metal catalysts-I. Preparation of the system platinum supported on polyfurfuryl alcohol Carbon. Carbon 9: 791–796.Google Scholar
  18. Schmitt, Jr., J. L., and P. L. Walker, Jr. 1972. Carbon molecular sieve supports for metal catalysts-H. Selective hydrogenation of hydrocarbons over platinum supported on polyfurfuryl alcohol carbon. Carbon 10: 87–92.Google Scholar
  19. Trimm, D. L., and B. J. Cooper. 1970. The preparation of selective carbon molecular sieve catalysts. Chem. Commun. 477–478.Google Scholar
  20. Trimm, D. L., and B. J. Cooper. 1973. Propylene hydrogenation over platinum/carbon molecular sieve catalysts. J. Catal. 31: 287–292.CrossRefGoogle Scholar
  21. Yang, R.T. 1987. Gas Separation by Adsorption Processes. Boston: Butterworths.Google Scholar

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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