Question

Zeolites are good shape catalysts because of:

• A. cage like structure
• B. branched structure
• C. honey comb like structure
• D. sStraight chains

Answer 1

Answer: (C)

honey comb like structure

Option $\left(C\right)$ is correct.

Zeolites are good shape catalysts because of honey comb like structure.

Zeolites are aluminosilicates i.e., three dimensional network silicates in which some silicon atoms are replaced by aluminium atoms. They are found in nature as well as synthesized for catalytic selectivity. Zeolites, before using as catalysts, are heated in vacuum so that the water of hydration is lost. As a result, zeolite becomes porous $i.e.$, the cavities in the cage-like structure which were occupied by the water molecules become vacant. The size of the pores is generally 260 $pm$ to 740 $pm$, because of which only those molecules can be adsorbed in these pores whose size is small enough to enter these cavities and also leave easily.