Explain the effect of temperature of langmuir isotherm?

Expert Solution

In the langmuir adsorption model,the adsorbate is considered as an ideal gas which occupies single site on the surface of adsorbent. Also during adsorption energy is released because of attractions between the adsorbate and adsorbent. Hence adsorption is an exothermic process.Now when the temperature is increased ,the kinetic energy or the thermal energy of the gaseous molecules increases and as such they deviates from ideality.In other words the increased kinetic energy of the gas molecules overcomes the electrostatic forces of attraction between the adsorbate and adsorbent molecules and thus the absorption capacity of adsorbate decreases.This can also be understood in a way that since adsorption is exothermic process ,so an increase in temperature will favour the backward reaction or desorption process according to Lechatelier principle.Hence an increase in temperature leads to decrease in adsorption capacity.

Amanda K answered 1 year ago

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