chemisorbs

Chemisorption is a type of adsorption where a gas molecule or atom becomes chemically bonded to a solid surface. Unlike physisorption, where the interaction is primarily physical and reversible, chemisorption involves the formation of strong chemical bonds between the adsorbate and the surface. This process typically results in a significant change in the electronic structure of the adsorbate and the surface.

The strength of chemisorption is often characterized by the heat of adsorption, which is generally much higher than that of physisorption. The process is often irreversible at room temperature, requiring elevated temperatures to desorb the adsorbate. Chemisorption is a crucial phenomenon in various fields, including catalysis, where it facilitates chemical reactions by providing active sites for reactants to bind and interact.

The mechanism of chemisorption can vary depending on the nature of the adsorbate and the surface. It may involve electron transfer, the formation of coordinate covalent bonds, or the breaking and reforming of chemical bonds. The specificity of chemisorption makes it highly selective, often leading to the preferential adsorption of certain molecules over others.

In summary, chemisorption is a strong, often irreversible adsorption process involving chemical bonding between an adsorbate and a solid surface. It plays a vital role in various applications, particularly in catalysis, where it enhances the reactivity of surfaces.