THERMAL-BEHAVIOR AND ADSORPTION PROPERTIES OF NATURAL STILBITE

Crystals collected from the Ellora valley (Aurangabad, MS, India) of t he Deccan traps of India have been characterized as a stilbite (St) by X-ray diffraction, IR spectroscopy and chemical analyses. The thermal behaviour was studied using TG and DTA techniques. The sample was exc hanged at reflux temperature with NH4Cl and NH(4)St was prepared. This was further transformed to the H-form of stilbite (HSt) by heating at 573 K for 12 h. The samples so prepared were used for adsorption stud ies. The comparative study of sorption of these samples shows an incre ase in the sorption capacity of HSt The isosteric heat was also comput ed for these samples.