Question

Explain shape selective catalyst catalyst is by zeolites

Answer 1

As we know that catalytic reacion is dependent on the pore structure of the catalyst & also the size of the reactant that whole process is known as shape selective catalysis.

Important points:-

1. 260 to 740 will be the pore size range in this.

2. Zeolite is in honey comb like structure.

$\sf{ \bold{3.} \: Formula \: of \: zeolite \: is \: Na_{x/n}\bigg[(ALO_{2}){x}(SiO_{2}){y}\bigg]\:z\: H_{2}O}$

4. It is also known as water softner as in this exchange of only cation occurs.

5. It is actually a 3D silicate.

Answer 2

Answer:

Explanation:

(i) The substance in whose presence the rate of a

chemical reaction changes, without causing any

chemical change to it is called a catalyst.

(ii) e.g. Potassium chlorate (KClO3

) decomposes

rapidly in presence of manganese dioxide (MnO2

)

to liberate O2

gas, where manganese dioxide acts

as a catalyst.

(ii) 2KClO3

∆

MnO2

2KCl + 3O2