Adsorption - Chemical Technology
7 important questions on Adsorption - Chemical Technology
What doe we mean with the term "surface area"of a solid catalyst?
Why does the rate of reaction of molecule A in a porous catalyst strongly depends on the accessibility of the active sites? (dispersed troughout the porous structure)
1. Film diffusion from Bulk A trough the boundary layer to the external surface.
2. Diffusion of A into the pores.
3. Adsorption of A on the inner surface of the catalyst.
4. Chemical surface reaction (A -> B)
5. Desorption from of B from the inner surface into the pores.
6. Diffusion of B trough the porous network.
7. Diffusion of B trough the boundary layer into the gas phase.
What kind of influence has temperature on adsorption and desorption? Also explain why.
- Adsorption:
- - Increased Temperature: Often leads to decreased adsorption due to enhanced molecular movement, reducing interactions.
- - Decreased Temperature: Often enhances adsorption as molecules have lower energy and remain bound to the surface longer.
- Desorption:
- - Increased Temperature: Promotes desorption as higher energy facilitates the release of adsorbed molecules.
- - Decreased Temperature: Reduces desorption, making it harder for adsorbed molecules to escape.
Reasons:
- Higher temperatures increase kinetic energy, resulting in greater movement of molecules.
- Adsorption is generally an exothermic process, while desorption is endothermic, which explains the temperature dependency on these processes.
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Why is physisorption considered as non specific for a surface but whereas chemisorption does?
- Physisorption involves weak van der Waals forces, making it less selective and more general for various surfaces.
- It is influenced by physical factors like surface area and temperature.
- Chemisorption, on the other hand, involves strong chemical bonds, resulting in specificity to the surface's chemical composition and structure.
- This selectivity arises from the requirement for compatible reactive sites for bonding.
What does the langmuir adsorption isotherm describe?
What is the difference between heterogeneous catalyst and biocatalyst and homogeneous catalyst?
Why does homogeneous or bio catalyst have no diffusion limitation?
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