439Application of Green Catalysis and Processes
Zeolites are crystalline, micro-porous, hydrated aluminosilicates that are built from
an innitely extending three-dimensional network of [SiO
4
]
4−
and [AlO
4
]
4−
tetra-
hedra linked to each other by the sharing of the oxygen atom. Generally, their
structure can be considered as inorganic polymer built from tetrahedral TO
4
units, where T is Si
4+
or Al
3+
ion. Each oxygen (O) atom is shared between two
Tatoms.
Zeolite from y ash: The disposal of coal y ash from coal-based power plants is a
problem of global concern today. In India, most of the utility thermal power and
sub-bituminous coal has high ash content (30–50%) resulting in the production
of a substantial quantity of y ash. Only a small por ...