CAJ | 학술논문

以正硅酸乙酯为前驱体,通过聚合溶胶路线制备出稳定的SiO_2溶胶和制膜液,采用浸浆法,经过一次涂膜,在平均孔径约为3 nm的γ-SiO_2中孔膜上制备出完整无缺陷的SiO_2微孔膜,考察了烧成温度对SiO_2粉末和SiO_2微孔膜气体渗透性能的影响.结果表明,在400～800℃焙烧温度下制备的SiO_2膜在200℃及0.3 MPa条件下对He的渗透通量为(7.29～12.7)×10~(-7) mol/(m~2·s·Pa),600℃下烧成的膜的理想分离因子分别为98(He/CO_2),49(He/O_2),64(He/N_2),79(He/CH_4)和91(He/SF_6),具有分子筛分效应.微孔SiO_2膜在水蒸气条件下的稳定性能取决于膜的烧成温度,400,600和800℃烧成的膜的水蒸气稳定压力分别为8,200和200 kPa.
이정규산을지위전구체,통과취합용효로선제비출은정적SiO_2용효화제막액,채용침장법,경과일차도막,재평균공경약위3 nm적γ-SiO_2중공막상제비출완정무결함적SiO_2미공막,고찰료소성온도대SiO_2분말화SiO_2미공막기체삼투성능적영향.결과표명,재400～800℃배소온도하제비적SiO_2막재200℃급0.3 MPa조건하대He적삼투통량위(7.29～12.7)×10~(-7) mol/(m~2·s·Pa),600℃하소성적막적이상분리인자분별위98(He/CO_2),49(He/O_2),64(He/N_2),79(He/CH_4)화91(He/SF_6),구유분자사분효응.미공SiO_2막재수증기조건하적은정성능취결우막적소성온도,400,600화800℃소성적막적수증기은정압력분별위8,200화200 kPa.
Preparation and hydrothermal stability of microporous silica membrane were studied. A stable SiO_2 polymeric sol was successfully synthesized with tetracthylorthosilicate as precursor through polymeric sol-gel route, α-Al_2O_3 supported defect-free mesoporous γ-Al_2O_3 disk membrane with average pore size of about 3 nm was fabricated via dip coating and subsequently calcined at 600℃. The effect of calcination temperature on the properties of SiO_2 powder and gas permeabilities of supported SiO_2 membranes, especially with regard to the hydrothermal stability of SiO_2 microporous membranes, was studied in detail. The results show that He permeability of SiO_2 membranes calcined at 400～800℃ was (7.29～12.7)×10~(-7) mol/(m~2·s·Pa) at 200 ℃ and 0.3 MPa. The permselectivity of He with respect to CO_2,O_2, N_2, CH_4 and SF_6 was 98, 49, 64, 79 and 91, respectively, indicating a molecular sieving effect. The calcination temperature played a key role in determination of the hydrothermal stability of microporous silica membrane, which was confirmed experimentally. The performance of SiO_2 membrane calcined at 400, 600 and 800℃ deteriorated under the H_2O pressures of 8, 200 and 200 kPa, respectively.