Mesostructured Silica SBA-16 with Tailored Intrawall Porosity Part 2: Diffusion

Abstract

In this Part 2 of the present work, the diffusivities of n-heptane, cumene, and mesitylene in the SBA-16 silica samples described in Part 1 have been measured by the zero length column (ZLC) method. A comparison is made between the diffusivities and diffusion apparent activation energies in these materials and in a series of SBA-15 samples of similar pore size and pore volume. The latter series was discussed in a previous work. Clear differences are indeed observed and rationalized in terms of differences in the pore structure of the two series of solids.