
%0 Journal Article
%A Bottomley, GA 
%A Evans, JA 
%T Volume changes associated with zeolite ionic exchange
%J Australian Journal of Chemistry
%D 1983/03/01
%V 36
%N 3
%P 419-432
%K 
%R https://doi.org/10.1071/CH9830419
%U https://www.publish.csiro.au/paper/CH9830419 
%X Aqueous suspensions of zeolite(4A) in the potassium and sodium forms have been separately exchanged with Ca2+ at 25ºC in a precision dilatometer to measure the associated system volume change, &#8710;Vobs. Similar experiments partially exchanged K+ into sodium zeolite(4A) and Na+ into potassium zeolite(4A). Tris(ethane-1,2-diamine)cobalt(III) chloride was also exchanged with sodium zeolite(13X). For the overall process &#8710;Vobs is small, generally well under 10 cm3 per mole of incoming cation exchanged. The results are discussed in terms of three contributions to the overall volume change: (i) the volume change of ionic replacement in the solution external to the zeolite (this is available from the known apparent molar volumes of the electrolytes); (ii) the small dimension changes of the zeolite lattices on exchange; (iii) the transfer of water between zeolite and the solution phase. 
