(521bw) Application of Silicalite-1 Zeolite Support in Propane Dehydrogenation

MFI-type silicalite-1 zeolites with spherical shape and hexagonal sheet shape were synthesized using ethyl orthosilicate as silicon source, which were then used in propane dehydrogenation to propylene reaction as catalyst support. The structure and surface properties of the silicalite-1 zeolites with two different morphologies and the supported Pt-based catalysts were characterized through SEM, XRD, TEM, N2 adsorption-desorption, Py-FTIR, NH3-TPD, 29Si MAS NMR and H2-TPR techniques. The influencing mechanism of silicalite-1 zeolites for catalytic properties was discussed. It indicated that spherical silicalite-1 support with large ex-surface area and a bunch of surface silanol defect sites increased the dispersion of active metals and strengthened the interaction between the active components and the support, for which the propylene conversion rate of the catalysts were improved.