Answer:
The catalytic reaction which depends upon
pore structure of catalyst and the size of the reactant and product molecules
is known as shape selective catalysts. Zeolites are good shape selective
catalyst because of honey comb like structure.
(i) They are microporous
aluminosilicates with Al?0?Si framework and general formula
(ii) The reactions taking place
in zeolites depend upon the .size and shape of the reactant and product
molecules as well as upon the pores and cavities of the zeolites..
(iii) Zeolites are widely used
as catalysts in petrochemical industries for cracking of hydrocarbonds and
isomerisation. They are also used for removing permanent hardness of water.
e.g., ZSM - 5 is a catalyst used
in petroleum industry
(A mixture of
hydrocarbons)
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