Thermal Behaviour and Adsorption Properties of Natural Stilbite

Crystals collected from the Ellora valley(Aurangabad, MS, India) of the Deccan traps of India have beencharacterized as a stilbite (St) by X-ray diffraction, IRspectroscopy and chemical analyses. The thermal behaviour was studiedusing TG and DTA techniques. The sample was exchanged at refluxtemperature with NH4Cl and NH4St was prepared. This was furthertransformed to the H-form of stilbite (HSt) by heating at 573 K for 12 h.The samples so prepared were used for adsorption studies. The comparativestudy of sorption of these samples shows an increase in the sorptioncapacity of HSt. The isosteric heat was also computed for these samples.