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Sources of Error in Sorption and Density Measurements

Abstract

In sorption measurements, volumetric or gravimetric procedures are commonly used to determine the amount adsorbed. At low pressures, thermomolecular flow and pressure differences according to Knudsen's law disturb measurements. In volumetry, calibration of the dead space is required; in gravimetry, the influence of buoyancy has to be taken into account. In both cases, adsorption of the calibrating gas, usually helium, may disturb the measurements [1]. From the calibration measurements, the density of the sample can in principle be calculated. However, it has been observed in many experiments that its value depends on the calibrating gas.

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References

  1. R. Staudt, G. Saller, M. Tomalla and J. U. Keller, Ber. Bunsenges. Phys. Chem., 97 (1993) 98.

    CAS  Google Scholar 

  2. E. Robens, G. Sandstede, G. Walter and G. Wurzbacher, 'Fluctuations of the weight indicated by a microbalance in the pressure range between 1 and 103 torr with the sample at a lower temperature than the beam'. In: C. H. Massen and H. J. van Beckum (Eds.): Vacuum Microbalance Techniques Vol. 7, Plenum, New York 70, p. 195.

  3. C. H. Massen, E. Robens, J. A. Poulis and Th. Gast, Thermochim. Acta, 82 (1984) 43.

    Article  Google Scholar 

  4. L. Ginoux and L. Bonnetain, Some problems about gas adsorption isotherm measurements by automated procedures in manometric devices. In: F. Rodriguez-Reinoso, J. Rouquerol, K. S. W. Sing and K. K. Unger (Eds.): Characterization of Porous Solids II. Elsevier, Amsterdam, 1991, p. 189.

    Google Scholar 

  5. E. L. Fuller, J. A. Poulis, A. W. Czanderna and E. Robens, Thermochim. Acta, 29 (1979) 315.

    Article  Google Scholar 

  6. I. F. Homfray, Z. Phys. Chem., 74 (1910) 129.

    CAS  Google Scholar 

  7. J. M. Fernbacher and L. A. Wenzel, Ind. Eng. Chem. Fundam., 11 (1972) 457.

    CAS  Article  Google Scholar 

  8. E. Robens, J. A. Poulis, C. H. Massen and K. K. Unger, Determination of the amount adsorbed from the gas phase in a porous solid. In: M. Ben Chanaa (Ed.): Proceedings of the XXVIth International Conference on Vacuum Microbalance Techniques, Marrakesh (Morocco), April 26–28, 1995, Université Cadi Ayyad, p. 21.

  9. A. López-Peinado, J. Rivera-Utrilla and J. D. López-González, Adsorption Sci. & Technol., 2 (1985) 31.

    Google Scholar 

  10. M. Grebner, Synthese und Eigenschaften von Dodecasil 1H als vielseitige Wirtsmatrix Dissertation, Mainz, 1994.

  11. H. Kuwabara, T. Suzuki and K. Kaneko, J. Chem. Soc. Faraday Trans., 87 (1991) 1915.

    CAS  Article  Google Scholar 

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Robens, E., Keller, J.U., Massen, C.H. et al. Sources of Error in Sorption and Density Measurements. Journal of Thermal Analysis and Calorimetry 55, 383–387 (1999). https://doi.org/10.1023/A:1010195013633

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  • DOI: https://doi.org/10.1023/A:1010195013633

  • buoyancy
  • density
  • helium
  • Knudsen effect
  • mass determination
  • sorption
  • thermomolecular flow