Q.What is shape selective catalysis?

Step 1 – Definition. A catalytic reaction that depends on the pore structure (size and shape of cavities) of the catalyst and on the size of the reactant and product molecules is called shape-selective catalysis.

Step 2 – Basis. Only those molecules whose size and shape allow them to enter the pores of the catalyst can be adsorbed and react; likewise, only product molecules small enough to leave the pores are formed. Molecules that are too large are excluded — so the catalyst "selects" reactions by molecular shape/size. …

Define it in terms of the pore-size/molecular-size matching that decides which molecules can …

• Confusing shape selectivity with catalyst selectivity toward a product (they are related but shape selectivity is specifically pore-size based). …