Synthesis of Mesostructured Material with Pore Wall Composed of the Primary Structure Units of Zeolite through the Dissolution of Zeolite

Mesostructured materials MSB and MSZ with the pore walls respectively composed of the structure units of zeolite β and ZSM-5, were successfully synthesized by a new method in which the silica-alumina precursors obtained through the dissolution of zeolites, assemble around the surfactant micelle of triblock copolymer EO20PO70EO20. Subsequently, the products are characterized by XRD, IR, TEM, N2-sorption, EDS and 29Si MAS NMR techniques. In the IR spectra of MSB and MSZ, the appearance of absorbance peaks characteristic of five-membered rings of zeolites in the range of 550-600cm-1 indicates that the primary structure units of zeolites are perhaps included in the pore walls of MSB and MSZ. N2 sorption data show that the pore walls of as-synthesized mesostructured materials are thicker than that of SBA-15. 29Si MAS NMR spectra of MSB and MSZ suggest the presence of Si-O-T(T=Si,Al) environments similar to those in zeolites. The hydrogenation dealkylation reaction of heavy aromatic on the MSB and MSZ shows higher conversion than the corresponding data on SBA-15, especially for MSB80 with the conversion difference as high as 9.78%. Thus, it is concluded that the pore walls of MSB and MSZ contain the primary structure units of zeolites.