By Duong D. Do
Covers issues of equilibria & kinetics of adsorption in porous media. even supposing gasoline part platforms are really thought of, the rules & options are appropriate to liquid part structures besides. CD-ROM incorporated.
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Extra resources for Adsorption analysis: Equilibria and kinetics (Series on Chem. Engineering)
For physical adsorption, this surface residence time is typically ranging between 1013 to 10'9 sec, while for chemisorption this residence time has a very wide range, ranging from 10'6 (for weak chemisorption) to about 109 for systems such as CO chemisorbed on Ni. Due to the Arrhenius dependence on temperature this average surface residence time changes rapidly with temperature, for example a residence time of 109 at 300K is reduced to only 2 sec at 500K for a system having a desorption energy of 120 kJoule/mole.
3-3) shows typical plots of the fractional loading versus the nondimensional pressure bP for the case of attraction between adsorbed molecules. Various values of c are used in the generation of these plots. 3-3: Plots of the fractional loading versus bP for the Fowler-Guggenheim equation When the value of c is greater than the critical value of 4, we see the two dimensional condensation when the pressure reaches the phase transition pressure. 03 An increase in the interaction (increase in c) will shift the phase transition pressure to the left, that is the phase condensation occurs at a lower pressure, which is attributed to the stronger attraction among adsorbed molecules.
The same set of transport mechanisms learnt in Chapter 7 is again considered in Chapter 8, but is dealt with in the framework of Maxwell-Stefan. This is the cornerstone in dealing with multicomponent diffusion in homogeneous media as well as heterogeneous media. We first address this framework to a homogeneous medium so that readers can grasp the concept of friction put forwards by Maxwell and Stefan in dealing with multicomponent systems. Next, we deal with diffusion of a multicomponent mixture in a capillary and a porous medium where continuum diffusion, Knudsen diffusion as well as viscous flow can all play an important role in the transport of molecules.