Zeolite properties and applications

From a chemical point of view the composition of an alumino-silicate zeolite, either mineral or synthetic, can be expressed by the following oxide formula  

The usually high thermal stability of the zeolites, their extensive inner and outer surface and the possibility to remarkably increase, via cation-exchange with NHJ and successive deammoniation, the Brpnsted or Lewis acid sites on them, allow some of these compounds (especially Linde X and Y, and mordenite) 

---