Hierarchical silicalite-1 structures based on pyrolized materials

The synthesis of silicalite-1 layers on pyrolyzed wood bodies with a desired shape was studied. The synthesis procedure is based in an “in situ” hydrothermal treatment of a precursor gel in which the support is immersed. Two different calcination methods were carried out, using a flow of air or N2 and air. Samples were characterized by means of X-ray diffraction, thermogravimetric analyses and N2 adsorption/desorption isotherms, revealing the existence of a micro/mesoporous hierarchical silicalite-1 structure.

► We have developed a method to produce pure silicalite-1 bodies.
► The bodies have a micro- meso-porosity, which was evidenced by N2 adsorption.
► Calcination with N2 and air preserves the mechanical strength of the bodies.
► The synthesis uses cheap wood macrotemplate.
► This method could be applied to other pyrolyzed materials and to other zeolites.