Synthesis of silicate materials with micro/macroporous bimodal pore systems

A series of macroporous silicates with zeolitic microporous frameworks have been successfully prepared Ly self-assembly of discrete colloidal crystals of silicalite-1, titanium silicalite-1(TS-l) and ZSM-5, using polystyrene( PS) spheres as templates. The properties of these novel materials were char acterized by means of XRD, IR, SEM, Si-29 MAS NMR and N-2 adsorption/desorp tion measurements, These materials show ordered spheroidal voids, which are interconnected in three dimensions through windows. The ordering of the ma cropores are mainly affected by the particle size of the colloidal zeolites .