Adsorption is the process by which molecules from a gas or liquid adhere to a solid surface. In catalysis, adsorption is a critical step, as reactants must adsorb onto the catalyst's surface to undergo chemical transformation. There are two types of adsorption: physisorption and chemisorption. Physisorption involves weak van der Waals forces, while chemisorption involves the formation of strong chemical bonds. Chemisorption is typically more important in catalysis as it leads to the activation of reactants.
