City Research Online

Abstract

This work comprises a study of ternary ion exchange behaviour of zeolite X in exchange systems involving the cations Na+ , K+ and Li+ or Ag+. Also reported are investigations into binary exchange systems involving pairs of the same cations, and methods of preparation of the K-X and Li-X zeolites. Methods of separating the phases after exchange are also discussed, together with the methods of analyses employed.

The ternary equilibria have been treated thermodynamically using a recently developed phenomenological model, and at the same time, the model has been tested for validity and ease of application. In particular, the computer procedures used in the model have been discussed, and their validity established. The work has shown that the inclusion of data from the conjugate binary exchanges increases the validity of the results from the ternary treatment. These binary data have also been treated separately.

Data from appropriate pairs of binary exchange systems have been used to predict standard free energies of conjugate binary systems and also of the corresponding ternary systems by means °f the 'triangle rule'. Binary data have also been used to test the applicability to zeolites of the Elprince-Babcock model originally developed for clays.

Publication Type:	Thesis (Doctoral)
Subjects:	Q Science > Q Science (General) Q Science > QD Chemistry
Departments:	School of Science & Technology School of Science & Technology > School of Science & Technology Doctoral Theses Doctoral Theses

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