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극미세 입자 Aluminosilicate 계 졸의 합성 및 응용 : (Ⅰ) SiO₂및 γ-AIOOH졸의 제조 및 케릭터라이제이션
현상훈,송재권,강범석 연세대학교 산업기술연구소 1993 논문집 Vol.25 No.1
Nanoparticulate silica sols could be synthesized by an interfacial hydrolysis reaction between TEOS and high alkaline water. The silica sols were extremely stable at pH of 8 and their average particle sizes were less than 3 nm, while very unstable between 4 and 5 of pH. The sol particles grew up to about 10 nm within 1 day in the region of pH less than 7. It was found that the silica sol with pH less than 2 was stabilized without further growing after 1 day-aging. The particle size of γ-AlOOH sols synthesized via the modified Yoldas-method could be controlled according to the mole ratio of nitric acid/aluminium tri-sec-butoxide(0.07∼1.0). The stable γ-AlOOH sol with the average particle size of 45 nm, which was prepared using the mole ratio of 0.07, was estimated to be suitable for coating reproducible γ-AlOOH membrane layers with the high specific surface area.
제올라이트 복합 분리막의 합성 및 특성화(II): ZSM-5 제올라이트 복합막의 합성 및 $CO_2$ 분리 효율
현상훈,송재권,김준학 한국세라믹학회 1997 한국세라믹학회지 Vol.34 No.7
ZSM-5 zeolite composite membranes have been synthesized from a silica sol solution containing TPABr as an organic template by the dip-coating and the pressurized-coating hydrothermal treatment techniques. The CO2 separation efficiency of synthesized composite membranes was also investigated. The permeation mechanism of CO2 through ZSM-5 membranses was the surface diffusion, and that of N2, O2, and He gases was Knudsen diffusion or activated diffusion depending on the synthetic method of membranes and the measurement temperature. The CO2/N2 separation factor of the membrane prepared by the dip-coating hydrothermal treatment was 2.5 at about 12$0^{\circ}C$, while the ZSM-5 composite membrane synthesized by the pressurized-coating hydrothermal treatment technique showed the CO2/N2 separation factor of 9.0 at room temperature higher than that ever reported in the literature.
제올라이트 복합 분리막의 합성 및 특성화(I): ZSM-5계 제올라이트의 합성
현상훈,김준학,송재권 한국세라믹학회 1996 한국세라믹학회지 Vol.33 No.9
The synthetic conditions and characteristics of ZSM-5 type zeolites (ZSM-5/silicalite) for the preparation of the zeolite composite membranes for gas separation were investigated. ZSM-5 zeolites could be synthesized by the hydrothermal treatment of the mixture of colloidal silica sol aluminum nitrate sodium hydroxide and TPABr at a temperature range of 150-17$0^{\circ}C$ in the autoclave. Silicalties were done from the solution of water glass water and TPABr. Their crystalline structures transformed from orthorhombic to monoclinic from and their pore structures of three-dimensional channels were opened as TPABr filling channels was burned off at the calcination temperature of 50$0^{\circ}C$. The specific surface area of the calcined zeolite was about 360 m3/g and its surface property was hydrophobic. Crystal sizes of ZSM-5 and silicalite were 0.5-1.0${\mu}{\textrm}{m}$ and 8-10${\mu}{\textrm}{m}$ respectively having no change due to the calcination. In particular the shape and the size of the ZSM-5 type zeolite were sensitively varied with silica sources and concentrations of reaction solutions/sols.