Synthesis of mesoporous ZSM-5 zeolite encapsulated in an ultrathin protective shell of silicalite-1 for MTH conversion

Farnoosh Goodarzi, Irene Pinilla Herrero, Georgios N. Kalantzopoulos, Stian Svelle, Andrea Lazzarini, Pablo Beato, Unni Olsbye, Søren Kegnæs*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Coke formation is a major reason in deactivation of acidic zeolite catalysts in industrial processes such as methanol to hydrocarbons conversion. Protecting the surface of acidic zeolite with an inert porous shell can greatly hinder the coke formation on the surface, and hence boost the lifetime of the catalyst. In this work, a solid-state steam-assisted method for synthesis of such optimized protective shell (silicate-1, ~15 nm thickness) is designed. This general and simple protocol can be applied to acidic zeolite catalysts to improve their catalytic lifetime. The silicalite-1 shell is synthesized on mesoporous ZSM-5 zeolite to explore its catalytic activity in methanol to hydrocarbons conversion. XPS and TEM analysis confirm the coverage of mesoporous zeolite crystals by non-acidic shell. In addition, nitrogen physisorption shows the accessibility of mesoporous ZSM-5 via microporous silicalite-1 network. Applying this protective shell increases the lifetime of the catalyst by 100% and its conversion capacity by 130%, in comparison to mesoporous ZSM-5 without the shell. The controlled formation of thin layer of microporous silicalite-1 around mesoporous ZSM-5 crystals (without growth of individual silicalite-1) accounts for enhanced catalytic improvement.
Original languageEnglish
Article number109730
JournalMicroporous and mesoporous materials
Volume292
Number of pages10
ISSN1387-1811
DOIs
Publication statusPublished - 2020

Keywords

  • Shell
  • Coke
  • Zeloite
  • Mesoporous
  • Hetergeneous catalysis
  • Methanol

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