check the zeochem's site
http://www.zeochem.com/types/types.htm (http://www.zeochem.com/types/types.htm)
they also have a list of papers covering the theory that are available upon request...
http://www.sigmaaldrich.com/Brands/Aldrich/Tech_Bulletins/AL_143.html (http://www.sigmaaldrich.com/Brands/Aldrich/Tech_Bulletins/AL_143.html)
I. Molecular Sieves
II. Activated Alumina
III. Activated Carbon
IV. Diatomaceous Earth
V. Ascarite II® Adsorbents
VI. Montmorillonites and other Mineral Adsorbents
VII. Drying Agents
VIII. Toxicity and Handling
IX. References