The activity of a catalyst has been explained in terms of spontaneous adsorption of reactant
Channel: Doubtnut
Date: 02/08/2020

The activity of a catalyst has been explained in terms of spontaneous adsorption of reactant moleculse on the surface of catlyst and ther by forming an activated adsorbed complex along with evolution of heat . The adorbed activated complex undergoes to decompositio to regencerate catlyst and give products . adorpton is of two types :   (i) Physical adsorptio due to van der Waal's  forces of attraction between reactant and catalyst molecules , weak , less exothermic, mulitlay and non-dirctional .   (ii) Chemical dasorpton due to free valencies , strong, more exothermic, unilayer. The extent of adormpotion `( x//m)` vs temperature at constant pressure gives isobars. Freundilish studied influence of pressure on the phusical adorptons and reported that log `x/m log K + 1/n log P`.   During adorption of reactant momecules on catalyst surface :