Synthesis and Sulfonation of Phenyl-Modified SBA-15 Mesoporous Molecular Sieve
HUANG Yanlei1, CHEN Yangying2, LIU Xiumei2, ZHOU Danhong 1*, FAN Yinheng1 (1 College of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, Liaoning, China; 2 State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, Liaoning, China)
The phenyl-modified SBA-15 (Ph-SBA-15) mesoporous molecular sieve was synthesized by one-step synthesis method involving co-condensation of tetraethoxysilane (TEOS) and phenyltriethoxysilane (PTES) in the presence of a poly(alkylene oxide) block copolymer PEO 20PPO 70PEO 20(P123) under acidic condition. When the sample was calcined at 300 ℃ for 10 h, the phenyl groups were still stable and the template P123 was completely removed. After sulfonation, the sulfonic groups were introduced into the Ph-SBA-15 molecular sieve. The structure and properties of the phenyl-modified mesoporous molecular sieve and the sulphonated product (HSO 3-Ph-SBA-15) were characterized by XRD, TEM, MAS NMR, IR and UV-Vis techniques. The Ph-SBA-15 and HSO 3-Ph-SBA-15 featured well-ordered hexagonal arrays of mesopores and the pore channels were similar to those in pure SBA-15. The HSO 3-Ph-SBA-15 behaved as the mesopores, with very homogeneous pore diameter of 5 7 nm. The introduced phenyl groups can be determined based on the absorption peaks in IR and UV-Vis spectra. The phenyl groups were stably connected in the silicon-wall, and the other organic compounds such as the template P123 were completely removed from the molecular sieve. The acid content was 4 19 mmol/g in HSO 3-Ph-SBA-15, whereas no acidity could be tested in pure SBA-15.