논문 해외 국제전문학술지(SCI급) Mercaptoamine-Assisted Post-Encapsulation of Metal Nanoparticles within Preformed Zeolites and their Analogues for Hydroisomerization and Methane Decomposition
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2023-04
- 저자명 Song, M., Eom, E., Shin, J. W., Cho, H. S.,* Kim, J.-C.,* and Jo, C.*
- 학술지명 Angew. Chem. Int. Ed.
- 발행처명 Wiley
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 6
- 원문 링크 https://onlinelibrary.wiley.com/doi/full/10.1002/anie.202303503
홈페이지논문 초록 (Abstract)
We report a general synthetic strategy for post-encapsulation of metal nanoparticles within preformed zeolites using post-synthetic modification. Both anionic and cationic precursors to metal nanoparticle are supported on 8- and 10-membered ring zeolites and analogues during wet impregnation using 2-aminoethanethiol (AET) as a bi-grafting agent. Thiol groups are coordinated to metal centers, whereas amine moieties are dynamically attached to micropore walls via acid-base interactions. The dynamic acid-base interactions cause the even distribution of the metal-AET complex throughout the zeolite matrix. These processes encapsulate Au, Rh, and Ni precursors within the CHA, *MRE, MFI zeolite, and SAPO-34 zeolite analogues, for which small channel apertures preclude the post-synthesis impregnation of metal precursors. Sequential activation forms small and uniform nanoparticles (1–2.5 nm in diameter), as confirmed through electron microscopy and X-ray absorption spectroscopy. Containment within the small micropores protected the nanoparticles against harsh thermal sintering conditions and prevented the fouling of the metal surface by coke, thus resulting in a high catalytic performance in n-dodecane hydroisomerization and methane decomposition. The remarkable specificity of the thiol to metal precursors and the dynamic acid-base interaction make these protocols extendable to various metal-zeolite systems, suitable for shape-selective catalysts in challenging chemical environments.