Uptake transient concentration profiles

Figure 36 compares the actual measurements of transient concentration profiles during molecular uptake by a silicalite-1 crystal as displayed in Fig. 34 with uptake simulations. The diagrams show the integrals of concentration in the x direction as a function of z (this is in longitudinal extension of the... 

Fig. 45 Comparison of the transient concentration profiles during methanol uptake by the MOF-type crystal as recorded by interference microscopy (symbols) with the corresponding profiles recalculated from the measured diffusivities with surface permeabilities (full line in Fig. 44) which lead to the best fit to the experimental points...

In all the transient concentration profiles considered so far (Figs. 36, 42, 45, 46, 48, and 50), in no case did the boundary concentration immediately assume the equilibrium value. The consequences of this finding on the relation between the transport resistances exerted by the intracrystalline bulk phase and by the crystal surface on the overall uptake and release behavior will be... 

Fig. 53 Transient profiles of 2-methylpropane as a guest molecule in a nanoporous material (crystal of type silicalite-1). a Overview of the intracrystalline concentration profile to s after the onset of adsorption, b Evolution of the guest profiles along the x axis at 0 to xm during uptake, c Host crystal with indication of the cross section to which the transient concentration profiles in d refer, e Evolution of the guest profiles along the x axis during release over different cross sections as indicated by c...

Figure 14. Shape, dimensions and transient concentration profiles during uptake of methanol in a ferrierite crystal measured by interference microscopy, (c) shows the actual profiles along the length of the crystal at the mid point, and (e) shows the same profiles normahzed by subtracting the effect of the roof-hke structures. AQ profiles are at the same times (0, 30, 130 and 370 secs). From Kortunov etal [81].

---