Increasing resolution of selectivity in alkene hydrogenation via diffusion length in core-shell MFI zeolite
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Related Research Unit(s)
Detail(s)
Original language | English |
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Pages (from-to) | 94-100 |
Journal / Publication | Catalysis Today |
Volume | 314 |
Online published | 10 Feb 2018 |
Publication status | Published - 15 Sept 2018 |
Link(s)
Abstract
We designed a core-shell zeolite structure comprises of palladium-deposited ZSM-5 core and silicalite-1 (S-1) shell which favors selectivity towards light olefin in hydrogenation via increased diffusion length. A well designed S-1/Pd/ZSM-5 core-shell structure was prepared via secondary crystallization of S-1 layer on the Pd/ZSM-5 core. The catalytic and selectivity performance of the S-1/Pd/ZSM-5 composite was evaluated in catalytic hydrogenation of alkenes in liquid phase. The synthesized S-1/Pd/ZSM-5 gives a much higher selectivity towards 1-hexene (87%) over cyclohexene (13%) even though both reactants are able to enter the 10-membered ring channels of the core-shell structure. The zeolitic core-shell composite also showed an increasing selectivity towards 1-hexene over 1-heptene as the S-1 layers built up, even though both are linear alkenes with similar kinetic diameter that are accessible to the MFI framework. In this work, we demonstrate a strong correlation between the thickness of the S-1 shell layer and the selectivity towards light olefins due to faster mass transfer rate. The design of the core-shell MFI structure is a new example of how selectivity in a zeolite-catalyzed reaction can be changed and enhanced without relying on typical molecular size exclusion process.
Research Area(s)
- Alkene hydrogenation, Core-shell structure, Diffusion length, MFI zeolite, Zeolite selectivity
Citation Format(s)
Increasing resolution of selectivity in alkene hydrogenation via diffusion length in core-shell MFI zeolite. / Jia, Xicheng; Jeong, Yanghwan; Baik, Hionsuck et al.
In: Catalysis Today, Vol. 314, 15.09.2018, p. 94-100.
In: Catalysis Today, Vol. 314, 15.09.2018, p. 94-100.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review