Synthesis and application of HZSM-5@silicalite-1 core-shell composites for the generation of light olefins from CH3Br

Na Li, Ying Ying Zhang, Lang Chen, Chak Tong AU, Shuang Feng Yin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

To improve activity and hinder deactivation, nonacidic polycrystalline silicalite-1 was contiguously coated on HZSM-5 to yield HZSM-5@silicalite-1 composites using a hydrothermal synthesis method. The obtained samples were examined as catalysts for the generation of light olefins (ethylene and propylene) from CH3Br, and found to show high catalytic activity, stability and high selectivity to the desired products. The excellent performance is attributed to the silicalite-1 shell which causes passivation of acid sites on the external surface of HZSM-5. It was observed that the HZSM-5@silicalite-1 composite with thicker coating (ZS-2) shows much higher stability and selectivity to light olefins (up to 80%) than that with thinner coating (ZS-1), indicating that the surface of HZSM-5 crystals of the latter was less covered. Based on the characterization results, it is deduced that the catalytic stability of ZS-2 is due to the silicalite-1 shell that hinders HZSM-5 from deactivation as a result of surface coking.

Original languageEnglish
Pages (from-to)76-80
Number of pages5
JournalMicroporous and Mesoporous Materials
Volume227
DOIs
Publication statusPublished - Jun 2016

Scopus Subject Areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

User-Defined Keywords

  • HZSM-5
  • HZSM-5@silicalite-1 composite
  • Light olefins
  • Natural gas

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