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प्रश्न
Describe the adsorption theory of catalysis.
उत्तर
Langmuir explained the action of catalysts in heterogeneous catalysed reactions based on adsorption. The reactant molecules are adsorbed on the catalyst surfaces, so this can also be called contact catalysis.
According to this theory, the reactants are adsorbed on the catalyst surface to form an activated complex which subsequently decomposes and gives the product.
The various steps involved in heterogeneous catalysed reactions are given as follows:
- Reactant molecules diffuse from bulk to the catalyst surface.
- The reactant molecules are adsorbed on the surface of the catalyst.
- The adsorbed reactant molecules are activated and form an activated complex which is decomposed to form the products.
- The product molecules are desorbed.
- The product diffuses away from the surface of the catalyst.
Hydrogenation of ethylene in presence of a nickel catalyst
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संबंधित प्रश्न
Define the term Inhibition.
In the reaction, \[\ce{H2O2_{(aq)} ->[I^-_{( aq)}] H2O_{(l)} + \frac{1}{2} O2_{(g)}}\] iodide ion acts as ____________.
Match the following.
| Column I | Column II |
| A) V2O5 | (i) High density polyethylene |
| B) Ziegler – Natta | (ii) PAN |
| C) Peroxide | (iii) NH3 |
| D) Finely divided – Fe | (iv) H2SO4 |
Match the following.
| Column I | Column II |
| A) Pure nitrogen | (i) Chlorine |
| B) Haber process | (ii) Sulphuric acid |
| C) Contact process | (iii) Ammonia |
| D) Deacons Process | (iv) sodium azide (or) Barium azide |
Which of the following is the correct option?
What are enzymes?
Explain the intermediate compound formation theory of catalysis with an example.
What is the difference between homogeneous and heterogeneous catalysis?
Zeigler-Natta Catalyst is ______.
Match List - I with List - II.
| List - I | List - II | ||
| (Processes/Reactions) | (Catalyst) | ||
| (A) | \[\ce{2SO2(g) + O2(g) -> 2SO3(g)}\] | (I) | Fe(s) |
| (B) | \[\ce{4NH3 (g) + 5O2(g) -> 4NO(g) + 6H2O (g)}\] | (II) | Pt (s) - Rh (s) |
| (C) | \[\ce{N2(g) + 3H2(g) -> 2NH3(g)}\] | (III) | V2O5 |
| (D) | \[\ce{Vegetable oil (l) + H2 -> Vegetable ghee (s)}\] | (IV) | Ni (s) |
Choose the correct answer from the options given below:
Match the catalysts to the correct processes:
| Catalysts | Process | ||
| (A) | TiCl4 | (i) | Wacker process |
| (B) | PdCl2 | (ii) | Ziegler - Natta polymerization |
| (C) | CuCl2 | (iii) | Contact process |
| (D) | V2O5 | (iv) | Deacon's process |
