Solution

The catalytic reaction that depends upon the pore structure of the catalyst and the size of the reactant and product molecules is called shape-selective catalysis.
Zeolites are good shape-selective catalysts because of their honeycomb-like structures.
Zeolites are micro porous aluminosilicates with three dimensional network of silicates in which some silicon atoms are replaced by aluminium atoms giving $$Al-O-Si$$ framework.
Zeolites are found in nature as well as synthesised for catalytic selectivity.