Journal of Porous Materials

, Volume 26, Issue 6, pp 1767–1779 | Cite as

Synthesis of core–shell ZSM-5 zeolite with passivated external surface acidity by b-oriented thin silicalite-1 shell using a self-assembly process

  • Dezhi Yi
  • Xin Xu
  • Xuan Meng
  • Naiwang Liu
  • Li ShiEmail author


A core–shell HZSM-5@silicalite-1 zeolite coated with a relatively continuous b-oriented thin silicalite-1 shell has been synthesized by a self-assembly method of reversing the negative surface charge of ZSM-5 crystals before the secondary hydrothermal crystallization. The growth orientation of shell crystals is confirmed by electron microscopy technology. N2 adsorption–desorption, X-ray photoelectron spectroscopy (XPS) and scanning transmission electron microscope with energy-dispersive X-ray spectrometry (STEM-EDS) measurements reveal that the core ZSM-5 crystals are coated with a relatively continuous monocrystal-thick silicalite-1 shell. The surface acidity analysis (Pyridine-FTIR and 2,4,6-collidine-FTIR) combined with the two probe chemical reactions using molecules that are either too large or adequately sized to access MFI pores has confirmed the passivation of external surface acid sites without hindering the intrinsic activity of the parent HZSM-5, which is consistent with the results from the electron microscopy and textural analysis.


ZSM-5@silicalite-1 Self-assembly b-Oriented Acidity Heterocatalysis 



This project was financially supported by the National Science Foundation for Young Scientists of China (No. 21706065), the Open Project of State Key Laboratory of Chemical Engineering (SKL-ChE-18C02), the China Postdoctoral Science Foundation (No. 2017M621389) and the Shanghai Sailing Program (No. 18YF1406300).

Supplementary material

10934_2019_776_MOESM1_ESM.doc (2.5 mb)
Supplementary material 1 (DOC 2590 kb)


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Authors and Affiliations

  1. 1.The State Key Laboratory of Chemical EngineeringEast China University of Science and TechnologyShanghaiChina
  2. 2.Applied PhysicsNorthwestern UniversityEvanstonUSA

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