渗透
膜
渗透
材料科学
化学工程
体积热力学
兴奋剂
活化能
高分子化学
色谱法
化学
有机化学
生物化学
光电子学
工程类
物理
量子力学
作者
Jing Yang,Jingtao Chen
标识
DOI:10.1016/j.jcou.2013.08.004
摘要
Pure hydrophilic silica (T-SiO2), methyl-modified silica (M-SiO2) and Ag-doped methyl-modified silica (Ag/M-SiO2) membranes have been prepared by sol–gel method. The added hydrophobic precursor methyltriethoxysilane has successfully introduced CH3 groups into the M-SiO2 and Ag/M-SiO2 materials. The formed metallic silver results from the transformation of AgNO3. The methyl ligands and Ag-doped can make the mean pore size and total pore volume of silica membranes larger. The apparent activation energy for H2 permeance in T-SiO2, M-SiO2 and Ag/M-SiO2 membranes were 3.65 ± 0.10, 3.64 ± 0.08 and 3.05 ± 0.08 kJ mol−1, respectively. Compared with the T-SiO2 membrane, the H2 permeation rates of the M-SiO2 and Ag/M-SiO2 membranes increase by 34.25% and 148.34%, respectively, and the H2/CO2 permselectivity of M-SiO2 membrane decreases by 10.93% while that of Ag/M-SiO2 membrane increases by 10.61%, when operated at 200 °C and a pressure difference of 0.35 MPa. After steam treatment and thermal regeneration, Ag/M-SiO2 membranes show a much smaller change to their original values in H2 permeance and H2/CO2 permselectivity than the T-SiO2 and M-SiO2 membranes.
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