Mesostructure pore model

We now establish the coupled clay cluster/macro-pore model at the meso-scale. For the sake of simplicity we adopt a particular form of mesostructure wherein the clay clusters are isolated from each other by the fissure (macropore) system.. Denote Vj. C, D. Jj the velocity, concentration and diffusion coefficient and the overall flux of species (NaCl), the governing equations in Q f reduce to... 

Figure 13.2 Pore models of mesostructures with symmetries of (a) pSmm, (b) laZd, (c) Pm3 , (d) /mim, (e) FdZm, and (f) Fm3m. (Reprinted with...

Recently reported meso- and macroscale self-assembly approaches conducted, respectively, in the presence of surfactant mesophases [134-136] and colloidal sphere arrays [137] are highly promising for the molecular engineering of novel catalytic mixed metal oxides. These novel methods offer the possibility to control surface and bulk chemistry (e.g. the V oxidation state and P/V ratios), wall nature (i.e. amorphous or nanocrystalline), morphology, pore structures and surface areas of mixed metal oxides. Furthermore, these novel catalysts represent well-defined model systems that are expected to lead to new insights into the nature of the active and selective surface sites and the mechanism of n-butane oxidation. In this section, we describe several promising synthesis approaches to VPO catalysts, such as the self-assembly of mesostructured VPO phases, the synthesis of macroporous VPO phases, intercalation and pillaring of layered VPO phases and other methods. 

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