Skip to main content
Log in

Selective Water Sorbents for Multiple Applications. 11. CaCl2 Confined to Expanded Vermiculite

  • Published:
Reaction Kinetics and Catalysis Letters Aims and scope Submit manuscript

Abstract

This paper presents the water sorption properties of a new selective water sorbent based on expanded vermiculite as a host matrix and calcium chloride as a hygroscopic salt. Sorption isobars, isosters and isotherms at T = 30–150°C and vapor partial pressure 8.2–42.0 mbar clearly show that at low water contents crystalline hydrates with 0.33, 1 and 2 molecules of water per 1 molecule of CaCl2 are formed in the pores. These hydrates are stable over a temperature change of 20–30°C and exhibit kinetically slow transformations. At higher water uptake, the vapor absorption leads to the formation of a CaCl2 aqueous solution inside the pores, which properties are close to those in the bulk. Isosteric sorption heat was found to depend on water sorption and change from 76.3 kJ/mol for solid hydrates to 39.1–46.6 kJ/mol.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

REFERENCES

  1. Yu.I. Aristov, M.M. Tokarev, G. Cacciola, G. Restuccia: React. Kinet. Catal. Lett., 59, 325 (1996).

    Google Scholar 

  2. Yu.I. Aristov, M.M. Tokarev, G. Cacciola, G. Restuccia: React. Kinet. Catal. Lett., 59, 335 (1996).

    Google Scholar 

  3. L.G. Godeeva, G. Restuccia, G. Cacciola, M.M. Tokarev, Yu. Aristov: Rus. J. Phys. Chem., 74, 2065 (2000, in press).

    Google Scholar 

  4. N. Popov: Production and Applications of Vermiculite, p. 9–13, Stroiizdat, Moscow 1964.

    Google Scholar 

  5. N.Z. Lyakhov, V.V. Boldyrev: Russ. Chem. Rev., 41, 919 (1972).

    Google Scholar 

  6. Kirk-Othmer Encyclopedia of Chemical Engineering, 4th Ed., v. 4, Wiley, New York 1992.

  7. Yu. Aristov, G. Di Marco, M.M. Tokarev, V.N. Parmon: React. Kinet. Catal. Lett., 61, 147 (1997).

    Google Scholar 

  8. B. Delmon: Introduction à la Cinètique Heterogene, Editions Technip., Paris 1969.

  9. B.M. Gurvich, R.R. Karimov, S.M. Mezheritskii: Rus. J. Appl. Chem., 59, 2692 (1986).

    Google Scholar 

  10. P. Debye, E. Hückel: Phys. Z., 24, 185 (1923).

    Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Rights and permissions

Reprints and permissions

About this article

Cite this article

Aristov, Y., Restuccia, G., Tokarev, M. et al. Selective Water Sorbents for Multiple Applications. 11. CaCl2 Confined to Expanded Vermiculite. Reaction Kinetics and Catalysis Letters 71, 377–384 (2000). https://doi.org/10.1023/A:1010351815698

Download citation

  • Issue Date:

  • DOI: https://doi.org/10.1023/A:1010351815698

Navigation