i. a. Zeolites are aluminosilicates with threedimensional network of silicates. b. Some silicon atoms in this network are replaced by aluminium atoms giving Al – O – Si framework which results in microporous structure.
ii. a. The reactions in zeolites are dependent on the size and shape of reactant or products,
b. It also depends on the pores and cavities of zeolites.
b. Therefore, zeolites are shape selective catalysts.
iii. In petroleum industry, zeolite catalyst ZSM5 converts alcohols directly to gasoline (petrol) by dehydration which gives a mixture of hydrocarbons.
