Zeolite - Microporus silicate or aluminosilicate structured minerals that can act as an absorbing filter or sieve on a molecular level. Mainly used by the petroleum industry for the cracking of petroleum or use as a filter against various compounds.
[Journal of Physical Chemistry; v100; 1814-19; 1996.]
[Water Environment and Technology; v8; 14; 1996.] 
Atmospheric Chemistry Glossary