Descibe some features of catalysis by zeolites.

Explanation

Zeolites are aluminosilicates, i,e., three dimensional network silicates in which some silicon atoms are replaced by aluminium atoms..They are found in näture as well as synthesised for catalytic selectivity. Zeolites before using as cätalyst.s, are heated in vacuum so that. the water of hydration is lost: As a resutt zeolites become porous, i.e., the cavities in the cage like stracture which are occupied by water molecules become vaçant. Features of Zeolites:
i. Zeolites have high porosity. due to presence of cavities of molecular dimensions.
ii. Elements such as .B a, M g, B, G a. and .P. can take place of Si and .Al in the zeolite framework.
iii. New class of highly siliceous zeolites has cataiytic properties.
iv. They are shape-selective catalyst.