关键词: 沸石结构单元, 介孔结构材料, 降解, 表面活性剂

Abstract: 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.

Key words: structure units of zeolite, mesostructured material, dissolution, surfactant