Q2(c). Adsorption theory of catalysis: steps and example
Explain the adsorption theory of catalysis. What are the various steps involved in it? Give one example to support your answer.
Answer in brief
Reactant molecules are chemisorbed on active sites of the solid catalyst; their bonds are weakened or broken and they react on the surface by a path of lower activation energy; the products desorb and release the sites. Steps: diffusion to the surface, adsorption, surface reaction, desorption, diffusion away. Example: N₂ + 3H₂ ⇌ 2NH₃ on iron.
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Coverslower activation energydissociativeHaber–Boschcatalytic converter
All parts of Question 2
- 2(a)(i) Dipole moments of CF₄ and CH₂F₂5 marks
- 2(a)(ii) CO₂ linear, SO₂ bent5 marks
- 2(a)(iii) Bond order of NO and NO⁺; magnetic behaviour10 marks
- 2(b) Partition function as a product of two partition functions10 marks
- 2(c) Adsorption theory of catalysis: steps and example10 marks