| 초록 |
The deca-dodecasil 3 rhombohedral (DDR) zeolite has a pore size of 0.36 × 0.44 nm2. This particular extent of the pore enables effective separation of CO2 (kinetic diameter of 0.33 nm) from N2 (0.364 nm) in post combustion carbon capture. Herein, the successful epitaxial growth of hydrophobic (h0h)-oriented DDR type zeolite membrane is reported. Methyltropinum iodide was used as a structure directing agent for the DDR seed layer. In compliance with the secondary growth time increment, inter-growth and the degree of the out-of-plane orientation also increased. Under dry conditions, a CO2/N2 separation factor (SF) was up to 11.9 at 50 °C. Noticeably, under wet conditions, the membrane showed even better performance, a CO2/N2 SF as high as 15.9 at 50 °C. The enhancement of the separation factor under wet conditions was attributed to the hydrophobicity of the DDR zeolite film which hinders the permeation of N2 molecules by adsorbed H2O molecules on the surface. |
