Thermal behaviour of zeolites is an important
property regarding their application in different fields. This
property mainly is related to the presence of water molecules in
their crystalline structures. It is known that zeolites give up water
molecules upon heat ing, a phenomena which affects remaining
water molecules and other clements in the framework. This
effect mainly depends on the cation type, amount of cations
present in the framework. heating rate, AJJ Si ratio and type of
the framework. In most zeolites dehydration causes unit cell
contract ion and in some cases st ructural collapse will happen
upon dehydrat ion. In the latter situation t he phenomena is an
irreversible process. In this project two samples of zeolite form
different deposits were investigated. The chemicnl analysis and
unit cell formula of the sample were firstly determined. Different
cataionic forms were then propared. The sample were all
subjected to thermal analysis a nd the effect of ingoi ng cations
were investingated.