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where is the mass of adsorbate adsorbed, is the mass of the adsorbent, is the pressure of adsorbate (this can be changed to concentration if investigating solution rather than gas), and and are empirical constants for each adsorbent–adsorbate pair at a given temperature.
An adsorption isotherm is a graph of Γ(P,T) versus partial pressure of the adsorbate(P/P 0) for a given constant temperature, where Γ(P,T) is the number of molecules adsorbed per surface area. [1] As the partial pressure of the adsorbate increases, the number of molecules per area also increases.
Adsorption is the process by which a gas (or solution) phase molecule (the adsorbate) binds to solid (or liquid) surface atoms (the adsorbent). The reverse of adsorption is desorption, the adsorbate splitting from adsorbent. In a reaction facilitated by heterogeneous catalysis, the catalyst is the adsorbent and the reactants are the adsorbate.
The adsorbent, as indicated in the figure, is assumed to be an ideal solid surface composed of a series of distinct sites capable of binding the adsorbate. The adsorbate binding is treated as a chemical reaction between the adsorbate gaseous molecule A g {\displaystyle A_{\text{g}}} and an empty sorption site S .
Chemisorption is a kind of adsorption which involves a chemical reaction between the surface and the adsorbate. New chemical bonds are generated at the adsorbent surface. Examples include macroscopic phenomena that can be very obvious, like corrosion [clarification needed], and subtler effects associated with heterogeneous catalysis, where the catalyst and reactants are in different pha
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The process of gas or liquid which penetrate into the body of adsorbent is commonly known as absorption. IUPAC definition absorption : 1) The process of one material (absorbate) being retained by another (absorbent); this may be the physical solution of a gas, liquid, or solid in a liquid, attachment of molecules of a gas, vapour, liquid, or ...
The adsorbate coverage is defined as the ratio between occupied and available adsorption sites. [3] The order of desorption, also known as the kinetic order, describes the relationship between the adsorbate coverage and the rate of desorption.