Abstract
Experimental measurements of heats of adsorption published in the literature are often in disagreement; differences of 10–20% are common. The three most widely used experimental methods are: (1) differentiation of adsorption isotherms at constant loading; (2) measurement of adsorption isosteres; (3) calorimetry. Results from these methods were compared for the systems nitrogen on CaA, oxygen on CaA, and carbon dioxide on NaX. Although the same materials and similar degassing procedures were used for all experiments, calorimetric heats are about 2 kJ/mol higher than the heats from isoteric measurements. Additional experiments are needed to bring these methods into exact agreement.
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References
Bülow, M., Stud. Surf. Sci. Catalysis, 83, 209–215 (1994).
Bülow, M. and P. Lorenz, in Fundamentals of Adsorption, A.I. Liapis (Ed.), pp. 119–128, Engineering Foundation, New York, 1987.
Coe, C.G., J.F. Kirner, R. Pierantozzi, and T.R. White, “Nitrogen Adsorption with aDivalent Cation Exchanged Lithium X-Zeolite,” US Patent 5,258,058, granted Nov. 2, 1993.
Dunne, J.A., R. Mariwala, M. Rao, S. Sircar, R.J. Gorte, and A.L. Myers, Langmuir, 12, 5888–5895 (1996a).
Dunne, J.A., M. Rao, S. Sircar, R.J. Gorte, and A.L. Myers, Langmuir, 12, 5896–5904 (1996b).
Everett, D.H. and Powl, J.C., J. Chem. Soc., Faraday Trans. 1, 72, 619–636 (1976).
Fitch, F.R., M. Bülow, and A.F. Ojo, “Adsorptive Separation of Nitrogen from Other Gases,” US Patent 5,464,467, granted Nov. 7, 1995.
McKee, D.W., “Separation of an Oxygen-Nitrogen Mixture,” US Patent 3,140,933, granted July 14, 1964.
Meier, W.M. and D.H. Olson, Atlas of Zeolite Structure, Third Revised Edition, Butterworth-Heinemann, Stoneham, MA, 1992.
Shen, D. and M. Bülow, Microporous and Mesoporous Materials, 22, 237–249 (1998).
Shen, D., S.R. Jak, M.Bülow, and A.F. Ojo, Stud. Surf. Sci. Catalysis, 125, 667–674 (1999).
Siperstein, F., R.J. Gorte, and A.L. Myers, Langmuir, 15, 1570–1576 (1999).
Sircar, S., J. Chem. Soc., Faraday Trans. I, 81, 1527–1540 (1985).
Sircar, S., Ind. Eng. Chem. Res., 31, 1813–1819 (1992).
Valenzuela, D. and A.L. Myers, Adsorption Equilibrium Data Handbook, Prentice Hall, Englewood Cliffs, NJ, 1989.
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Shen, D., Bülow, M., Siperstein, F. et al. Comparison of Experimental Techniques for Measuring Isosteric Heat of Adsorption. Adsorption 6, 275–286 (2000). https://doi.org/10.1023/A:1026551213604
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DOI: https://doi.org/10.1023/A:1026551213604