| 초록 |
Biogas is a clean, long-lasting energy source that can be used to replace or supplement traditional fossil fuels. To reach the roughly 90–95 percent purity of CH4, biogas upgrading is necessary, primarily by the efficient separation of CO2 (0.33 nm) and CH4 (0.38 nm). High-quality DDR type zeolite membranes via hetero-epitaxial growth (with a pore size of 0.36 × 0.44 nm2) showing both high flux and permselectivity for CO2 under both dry and wet condition were used in this study. The separation performances in terms of membrane properties were compared with module properties of both CO2 and CH4 under dry and wet conditions. Surprisingly, required separation performance for biogas upgrading was attained at a limited processing capacity in spite of the high intrinsic membrane properties of the hetero-epitaxially grown zeolite membrane. This emphasizes the importance of identifying the optimal operating conditions through the link between the membrane and module properties. |
