| 微孔SiO_2膜在水蒸气条件下的稳定性能 |
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| 引用本文： | 漆虹,韩静,江晓骆,陶振,邢卫红,范益群.微孔SiO_2膜在水蒸气条件下的稳定性能[J].过程工程学报,2010,10(1):161-166. |
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| 作者姓名： | 漆虹 韩静 江晓骆 陶振 邢卫红 范益群 |
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| 作者单位： | 材料化学工程国家重点实验室,南京工业大学膜科学技术研究所,江苏,南京,210009 |
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| 基金项目： | 国家重点基础研究发展计划(863)基金资助项目(编号:2009CB623400);;国家自然科学基金青年基金资助项目(编号:20906047);;化学工程联合国家重点实验室开放基金资助项目(编号:SKL-ChE-09A01);;南京市留学回国人员基金资助项目 |
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| 摘 要： | 以正硅酸乙酯为前驱体,通过聚合溶胶路线制备出稳定的SiO2溶胶和制膜液,采用浸浆法,经过一次涂膜,在平均孔径约为3nm的γ-Al2O3中孔膜上制备出完整无缺陷的SiO2微孔膜,考察了烧成温度对SiO2粉末和SiO2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SiO2膜在200℃及0.3MPa条件下对He的渗透通量为(7.29～12.7)×10-7mol/(m2·s·Pa),600℃下烧成的膜的理想分离因子分别为98(He/CO2),49(He/O2),64(He/N2),79(He/CH4)和91(He/SF6),具有分子筛分效应.微孔SiO2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200kPa.
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| 关 键 词： | 微孔陶瓷膜 SiO2膜 水热稳定性 气体分离 |
| 收稿时间： | 2009-10-30 |
Hydrothermal Stability of Microporous SiO_2 Membranes |
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| QI Hong,HAN Jing,JIANG Xiao-luo,TAO Zhen,XING Wei-bong,FAN Yi-qun.Hydrothermal Stability of Microporous SiO_2 Membranes[J].Chinese Journal of Process Engineering,2010,10(1):161-166. |
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| Authors: | QI Hong HAN Jing JIANG Xiao-luo TAO Zhen XING Wei-bong FAN Yi-qun |
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| Affiliation: | State Key Laboratory of Materials-Oriented Chemical Engineering;Membrane Science and Technology Research Center;Nanjing University of Technology;Nanjing;Jiangsu 210009;China |
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| Abstract: | 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. |
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| Keywords: | microporous ceramic membrane SiO2 membrane hydrothermal stability gas separation |
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