Q.1 what role does adsorption play in heterogenous Catalyst ?
Q.2 Why is adsorption always endithermic?
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Role of adsorption in a catalytic reaction. The role ofheterogeneous catalysis has been explained on the basis of adsorption theory postulated by Faraday. According to it: Due to unsatisfied valences forces on the catalyst surface, the molecules of the gaseous reactants get adsorbed in unimolecular layer.
Adsorption plays an important role in heterogeneous catalysis. ... (i) The concentration of reactants on surface of solid adsorbent increases and it becomes easier for molecules to attack each other for effective collisions, forming products.
2. (i) Adsorption leads to a decrease in the residual forces on the surface of the adsorbent. This causes a decrease in the surface energy of the adsorbent. Therefore, adsorption is alwaysexothermic. (ii) ΔH of adsorptionis always negative.
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ANSWER 1. Heterogeneous catalyst usually involves gaseous reactants and solid catalyst due to its physiorption of chemiosorption the reactant molecules are absorbed on the surface and the rate of reaction
ANSWER 2. During adsorption energy is released due to presence of attraction between adsorbate and absorbent molecules . Hence adsorption is exothermic process.
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