The main results obtained by using IR, Raman and W-Vis techniques concerning the structure of the Ti(IV) center in Ti-silicalite is briefly reviewed and discussed with recent XAFS results. The Ti(1V) is in tetrahedral coordination in vacuo and expands its coordination sphere upon interaction with adsorbates. Present EXAFS results indicate, for the dehydrated sample, a fust shell coordination nu...

Intracrystalline zeolite silanol defect groups (≡SiOH) were modelled in silicalite (silica ZSM-5, MFI) using experimental data. We make a molecular dynamics study on the self-diffusivity of benzene with defects. The simulations at three different loadings (1, 3 and 5 per unit cell) temperatures (298, 348 398 K) allow to calculate self-diffusivity, adsorption energy activation energy. results sh...

Pt/Sn-containing MFI zeolites prepared by one-pot hydrothermal methods are highly active and selective catalysts for propane dehydrogenation. An alternative preparation method is reported alongside an in-depth characterization of Pt Sn before after reaction. species dispersed on highly-defective Silicalite-1 show a significantly long catalytic lifetime with improved coke resistance, but increas...