An Extrinsic-Pore-Containing Molecular Sieve Film: A Robust, High-Throughput Membrane Filter
- An Extrinsic-Pore-Containing Molecular Sieve Film: A Robust, High-Throughput Membrane Filter
- 최낙원; 홍성원; 정양환; Hionsuck Baik; Alex C. K. Yip; 최정규
- Issue Date
- Angewandte Chemie international edition
- VOL 60, NO 3-1331
- MFI type zeolites with 10memberedring pores (ca. 0.55？nm) have the ability to separate pxylene (ca. 0.58？nm) from its bulkier isomers. Here, we introduced nonzeolitic micropores (ca. 0.6？1.5？nm) and mesopores (ca. 2？7？nm) to a conventional microporous MFI type zeolite membrane, yielding an unprecedented hierarchical membrane structure. The uniform, embedded nonzeolitic pores decreased defect formation considerably and facilitated molecular transport, resulting in high pxylene permselectivity and molar flux. Specifically, compared to a conventional, crack networkcontaining MFI membranes of similar thickness (ca. 1？μm), the mesoporous MFI membranes showed almost double pxylene permeance (ca. 1.6±0.4×10？7？mol？m？2？s？1？Pa？1) and a high p/oxylene separation factor (ca. 53.8±7.3 vs. 3.5±0.5 in the conventional MFI membrane) at 225？°C. The embedded nonzeolitic pores allowed for decreasing the separation performance degradation, which was apparently related to coke formation.
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