Shape-Selective Catalysis by Zeolites

When a catalyst's action depends on the size of its pores relative to the size of the reactant and product molecules, it is called shape-selective catalysis.

Zeolites are the classic shape-selective catalysts, thanks to their honeycomb structure. They are microporous aluminosilicates with a three-dimensional silicate network in which some silicon atoms are replaced by aluminium, giving an Al–O–Si framework. Which reactions proceed depends on how well the reactant and product molecules fit the zeolite's pores and cavities. Zeolites occur naturally and are also synthesised for tailored selectivity. …