What do you understand by shape selective catalysis? Why are zeolites good shape selective catalysts?

<p>This is a Long Answers Type Questions as classified in NCERT Exemplar</p><p><strong>Ans:</strong> Catalytic reaction which depends on the pore structure of catalyst and size of the reactant, product molecules is known as shape-selective catalysis. Zeolites are considered as good shape-selective catalysts due to their honeycomb-like structures. They are aluminosilicates with three-dimensional network of silicates wherein some of the silicon atoms are replaced by aluminium atoms giving Al-O-Si frame work. The reactions taking place in zeolites depends upon size and shape of reactant and product molecules, the pores and cavities of the zeolites also. They are found in nature and synthesised for catalysts selectivity. Zeolites are widely used as catalysts in petrochemical industries for cracking of hydrocarbons and isomerisation.</p>

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