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submitted on 02.01.2019 and posted on 03.01.2019by Valentin Smeets, Cédric Boissière, Clément Sanchez, Eric M. Gaigneaux, Elise Peeters, Bert F. Sels, Michiel Dusselier, Damien Debecker
present the aerosol-assisted sol-gel preparation of hierarchically porous TiO2–SiO2
catalysts having a sphere-like shell morphology and a high Ti dispersion. In
order to control the porosity at the micro-, meso- and macro- levels, we use
the evaporation-induced self assembly (EISA) of a surfactant, possibly combined
with polymer beads as hard templates. These catalysts are tested for the
epoxidation of cyclohexene with cumene hydroperoxide as oxidant, and their
performance is compared to the reference TS-1 zeolite. The high catalytic
performance observed with the catalysts prepared by aerosol stems from their
high specific surface area, but also from the short diffusion path length generated
by the meso-/macro-pore architecture which provide entryways for bulky
reactants and products.