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Taking two examples of heterogeneously calalytic reaction, explain how a heterogeneous catalyst helps in the reaction. |
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Answer» Solution :When the reactants and products are in different physical state from the catalyst, it is a case of heterogeneous catalysis. `V_2O_5` and Pt are heterogeneous CATALYSTS in Contact PROCESS and Ostwald Process, respectively. (i) Contact Process : `2SO_2(G) + O_2(g) overset(V_2O_5)iff 2SO_3(g)` (ii) Ostwald.s Process : `4NH_3(g) + 5O_2 (g) underset(1120K) overset(Pt)to 4NO(g) + 6H_2O (g)` Reacting gases get adsorbed on heterogeneous solid catalyst, their concentration on the surface increases and probability of collisions increases which result in increase in number of effective collisions, RESULTING in increase in rate of reaction. Products FORMED get desorbed from the catalyst and more reacting gases get adsorbed and react leading the formation of more products. |
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