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Surface Chemistry
Explain the following observations:
(a) Cottrell’s smoke precipitator is fitted at the mouth of the chimney used in factories.
(b) Physical adosption is multi layered, while chemisorption non-tayered.
Answer:
(a) Smoke contains positively charged colloidal particles which are separated by Cottrell’s smoke precipitator.
(b) Physical adsorption is multilayered because forces between adsorbate and adsorbent molecules are of Vander Waal's type. Chemisorption is non-layers because forces of attraction are of chemical bond type.
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In Haber's process, hydrogen is obtained by reacting methane with steam in presence of NiO as catalyst. The process is known as steam reforming. Why is it necessary to remove CO when ammonia is obtained by Haber’s process?
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