Question

What is the effect of increase of temperature on the adsorption of a gas on a solid surface?

Answer 1

An increase in temperature generally decreases the adsorption of a gas on a solid surface in physical adsorption because it is an exothermic process driven by weak van der Waals forces. Higher temperature reduces these forces, thus lowering adsorption. In chemisorption, adsorption first increases due to activation energy requirements, then decreases as temperature rises further, as it involves stronger chemical bonds. Overall, adsorption decreases with temperature rise for physical adsorption and shows a peak then decline in chemisorption.