Thermal Behaviour of Two Iranian Natural Zeolites

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.