| 학회 |
한국화학공학회 |
| 학술대회 |
2009년 가을 (10/22 ~ 10/23, 일산 KINTEX) |
| 권호 |
15권 2호, p.2292 |
| 발표분야 |
촉매 및 반응공학 |
| 제목 |
Synthesis of Ultrathin MFI Zeolite with a Single-Unit-Cell Thickness |
| 초록 |
Zeolites are crystalline microporous materials, which have been widely used as catalysts in petrochemistry. Strong acid sites in the uniform micropores enables size- and shape-selectivities. Despite the advantages, the sole presence of micropores imposes a diffusion limitation. Reactions involving larger molecules than micropores cannot be hosted by zeolites. Syntheses of zeolite nanocrystals, exfoliation of layered zeolites, and mesopore generation via templating strategies were demonstrated as a means of reducing zeolite thickness and thereby achieving a minimal diffusion path length. Here, we present a zeolite synthesis strategy using bifunctional surfactants that can direct structures in meso- and micro-length scales simultaneously. This led to direct crystallization of MFI zeolite nanosheets, in which the framework thickness corresponded to only a single unit cell dimension along b-axis (2.0 nm). Due to the external acid sites, the zeolites were highly active for catalytic conversion of large organic molecules. Furthermore, as compared with bulk zeolites, the zeolite nanosheets exhibited a dramatic increased catalyst lifetime in methanol-to-gasoline conversion. |
| 저자 |
나경수1, 최민기1, 김정남1, Yasuhiro Sakamoto2, Osamu Terasaki3, 유 룡1
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| 소속 |
1한국과학기술원, 2Stockholm Univ., 3한국과학기술원 / Stockholm Univ. |
| 키워드 |
catalyst; heterogeneous; zeolite; MFI; nanosheet; lamellar; ordered; mesoporous; methanol to gasoline
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