Question
(a) In which of the following does adsorption take place and why?
(i) Silica gel placed in the atmosphere saturated with water.
(ii) Anhydrous CaCl2 placed in the atmosphere saturated with water.
(b) How does BF3 act as a catalyst in industrial process?
(c) Give an example of shape selective catalysis.
Solution
Answer:
a)
i) In silica gel adsorption take place due to attraction and retention of water molecule on at the surface
ii) Anhydrous CaCl2 undergoes adsorption because it combine with water molecule to form hydrated calcium chloride CaCl2.2H2O
b) It is because BF3 is an electron deficient compound and helps to generate electrophile.
thus it is act as a catalyst in industrial process.
c) 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.
a)
i) In silica gel adsorption take place due to attraction and retention of water molecule on at the surface
ii) Anhydrous CaCl2 undergoes adsorption because it combine with water molecule to form hydrated calcium chloride CaCl2.2H2O
b) It is because BF3 is an electron deficient compound and helps to generate electrophile.
thus it is act as a catalyst in industrial process.
c) 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.
An important zeolite catalyst used in the petroleum industry is ZSM-5. It converts
alcohols directly into gasoline (petrol) by dehydrating them to give a mixture of hydrocarbons.
alcohols directly into gasoline (petrol) by dehydrating them to give a mixture of hydrocarbons.
