Desorption - an overview | ScienceDirect Topics
WEBDesorption is a phenomenon contradictory to adsorption, which occurs as a final catalytic step in heterogeneous-catalyzed reactions. It involves the removal of surface-adsorbed species and makes the surface ready for …
2.6: The Desorption Process - Chemistry LibreTexts
WEBFeb 22, 2022 · an atomic adsorbate may react with the substrate to yield a specific surface compound, or diffuse into the bulk of the underlying solid. the species may desorb from the surface and return into the gas phase. The last of these options is the desorption process.
Adsorption, Absorption and Desorption - What's the Difference?
WEBAug 24, 2014 · The major difference between adsorption and absorption is that one is a surface process and the other a bulk process. Adsorption — takes place on the surface of a substrate. Absorption — one substance enters the bulk, or volume, of another substance e.g. a gas absorbed by a liquid.
Desorption - an overview | ScienceDirect Topics
WEBDesorption and regeneration studies are important in adsorption. Desorption may occur either by thermal treatment or through suitable desorbing agents.
Desorption - an overview | ScienceDirect Topics
WEBDesorption refers to the process of chemical species being emitted from a solid surface, either without chemical conversions or after a chemical reaction. The rate of desorption depends on factors such as the density of the species, the strength of bonding to the surface, and the surface temperature.
Kinetics of Adsorption, Desorption and Reactions at Surfaces
WEBWe review the kinetic theories of adsorption, desorption, surface diffusion, and surface reactions, emphasizing the physics and chemistry underlying these processes. In particular, the need for local equilibrium in setting up macroscopic rate equations is discussed...
WEBFor a simple unimolecular desorption step, an adsorbed molecule with the requisite activation energy will desorb within the period of one vibration perpendicular to the surface, hence the rate of desorption is:
Kinetics of Sorption—Desorption | SpringerLink
WEBKinetics of Sorption—Desorption. The fate of nutrients, pollutants and other solutes in natural waters is coupled to their distribution between solid, aqueous and gas phases. The processes of phase distribution are many, including penetration and absorption into one of the phases, or accumulation at the interface between them.
Desorption kinetics from a surface derived from direct imaging of …
WEBMay 16, 2014 · Here we report a low-energy electron microscopy investigation in which a surface is microscopically imaged while simultaneously temperature-programmed desorption is recorded. The data show that...
Desorption - an overview | ScienceDirect Topics
WEBDesorption represents an emission process of chemical species on a solid surface. There are two cases: (i) the emission of the species without chemical conversions just after breaking its bond with surface atoms, and (ii) emission of new molecules following a chemical reaction of the species (association or decomposition).
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