Q.Which of the following is a shape selective catalyst ?

Shape-selective catalysis is catalysis in which the reaction depends on the pore/cavity size of the catalyst and on the size of the reactant and product molecules. Zeolites are the classic shape-selective catalysts.

Zeolites are three-dimensional network aluminosilicates with a honeycomb-like structure containing many small cavities and pores of fixed size (typically 260-740 pm). Features of catalysis by zeolites:

• They are microporous with pores of molecular dimensions, so only molecules small enough to enter the pores can react — hence the reaction is shape/size selective. …