TY - JOUR
T1 - Hydrothermal stability of microporous SiO2 membranes
AU - Qi, Hong
AU - Han, Jing
AU - Jiang, Xiao Luo
AU - Tao, Zhen
AU - Xing, Wei Hong
AU - Fan, Yi Qun
PY - 2010/2
Y1 - 2010/2
N2 - Preparation and hydrothermal stability of microporous silica membrane were studied. A stable SiO2 polymeric sol was successfully synthesized with tetraethylorthosilicate as precursor through polymeric sol-gel route. α-Al2O3 supported defect-free mesoporous γ-Al2O3 disk membrane with average pore size of about 3 run was fabricated via dip coating and subsequently calcined at 600°C. The effect of calcination temperature on the properties of SiO2 powder and gas permeabilities of supported SiO2 membranes, especially with regard to the hydrothermal stability of SiO2 microporous membranes, was studied in detail. The results show that He permeability of SiO2 membranes calcined at 400-800°C was (7.29~12.7)× 10-7 mol/(m2·s·Pa) at 200°C and 0.3 MPa. The permselectivity of He with respect to CO2, O2, N2, CH4 and SF6 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 SiO2 membrane calcined at 400, 600 and 800°C deteriorated under the H2O pressures of 8, 200 and 200 kPa, respectively.
AB - Preparation and hydrothermal stability of microporous silica membrane were studied. A stable SiO2 polymeric sol was successfully synthesized with tetraethylorthosilicate as precursor through polymeric sol-gel route. α-Al2O3 supported defect-free mesoporous γ-Al2O3 disk membrane with average pore size of about 3 run was fabricated via dip coating and subsequently calcined at 600°C. The effect of calcination temperature on the properties of SiO2 powder and gas permeabilities of supported SiO2 membranes, especially with regard to the hydrothermal stability of SiO2 microporous membranes, was studied in detail. The results show that He permeability of SiO2 membranes calcined at 400-800°C was (7.29~12.7)× 10-7 mol/(m2·s·Pa) at 200°C and 0.3 MPa. The permselectivity of He with respect to CO2, O2, N2, CH4 and SF6 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 SiO2 membrane calcined at 400, 600 and 800°C deteriorated under the H2O pressures of 8, 200 and 200 kPa, respectively.
KW - Gas separation
KW - Hydrothermal stability
KW - Microporous ceramic membrane
KW - SiO membrane
UR - http://www.scopus.com/inward/record.url?scp=77950348974&partnerID=8YFLogxK
M3 - 文章
AN - SCOPUS:77950348974
SN - 1009-606X
VL - 10
SP - 161
EP - 166
JO - Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering
JF - Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering
IS - 1
ER -