| 학회 | 한국공업화학회 |
| 학술대회 | 2022년 봄 (05/11 ~ 05/13, 제주국제컨벤션센터(ICC JEJU)) |
| 권호 | 26권 1호 |
| 발표분야 | 포스터-환경·에너지 |
| 제목 | The difficult role of defects in polycrystalline MFI zeolite membrane on xylene separation performance: with quantitative analysis |
| 초록 | By fluorescence confocal optical microscopy (FCOM) we can obtain processing images about the defect structure in c-out-of-plane oriented MFI membrane. That can lead to the identification and understanding of two types of defects (cracks and grain boundary defects). Also, we found that the amount of defects in the entire zeolite membrane was close to ~1%, but it provided a non-selective and facile pathway accounting for ~58% of the total molar flux. Surprisingly, in spite of the lower density of cracks, wider cracks (~7.8-8.2 nm) accounted for the much higher molar flux of permeation components compared to major. Indeed, the cracks mainly degraded p-/o-xylene separation performance of the MFI membrane. Finally, we found that the molar flux of o-xylene in binary mixtures increased significantly in the in the presence of p-xylene, because flexible MFI zeolite structure after the adsorption of p-xylene increases in the crack size. |
| 저자 | 박산하, 홍성원, 최정규 |
| 소속 | 고려대 |
| 키워드 | MFI zeolite; defect; xylene separation |
