Increasing resolution of selectivity in alkene hydrogenation via diffusion length in core-shell MFI zeolite

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

13 Scopus Citations
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Author(s)

  • Xicheng Jia
  • Yanghwan Jeong
  • Hionsuck Baik
  • Jungkyu Choi
  • Alex C.K. Yip

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)94-100
Journal / PublicationCatalysis Today
Volume314
Online published10 Feb 2018
Publication statusPublished - 15 Sept 2018

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.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review