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Relation between immersion enthalpy and the acidity of clay pillared minerals

Journal of Thermal Analysis and Calorimetry, ISSN: 1388-6150, Vol: 92, Issue: 3, Page: 899-904
2008
  • 11
    Citations
  • 0
    Usage
  • 6
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    11
    • Citation Indexes
      11
  • Captures
    6

Article Description

Total acidity for a series of modified clays obtained from a natural vermiculite is determined through temperature programmed desorption (TPD) using ammonia as probe molecule. Results obtained for the acidity range from 15.1 to 68.5 meq/100 g. Immersion enthalpies of the clays in benzene, water and aqueous solutions of NH 0.058 M and NaHCO 0.053 M are determined. The results obtained show that immersion enthalpies in benzene and water are between -6.26 and -25.6 J g and -2.10 and 5.55 J g , respectively and are smaller than the values obtained for the immersion enthalpies in the solutions. Immersion enthalpy values in NH solution are greater than the obtained using NaHCO. Linear relations between the total acidity of the clays and the immersion enthalpies in the basic solutions are determined. An interaction factor using ammonia is calculated since the relation between the immersion enthalpy in ammonia solution and in water and it may be deduced that the relation with the total acidity is of second order tendency between them. © 2008 Springer Science+Business Media, LLC.

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