Concentration vs. time dependence

Figure 1.4. Concentration vs time dependences for a reversible reaction...

The basic mathematical model for a calculation of concentration vs. time dependences in sorbent beds accounts for non-isothermal sorption in biporous sorbent particles. It considers mass and energy balances in the interparticle void space of the bed and in the macro- and micropores of sorbent particles. Thus, it comprises three spatial coordinates, besides time, (0 < t < co) (i) the height z along the bed, (0 < z < L) (ii) the radial direction r in macropores of particles, (0 < r < Rp) and (hi) the radial direction p in their micropores, (0 < p < Rzi). Different geometries may exist in each single direction but in each of those geometries the transport equations are one-dimensional. For zeolite-based biporous particles, sorption in the macropores is negligible. These pores serve as transport pores, only. Sorption takes place, exclusively, in micropores. 

Fig. 4.28 Concentration vs. time dependence for different catalysts (see explanations in the text).

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