Stable and reusable hierarchical ZSM-5 zeolite with superior performance for olefin oligomerization when partially coked

Hend Omar Mohamed, Rajesh K. Parsapur, Idoia Hita, José Luis Cerrillo, Adrian Ramírez, Kuo Wei Huang, Jorge Gascon, Pedro Castaño*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The character of coke is typically regarded as a “deactivator” in zeolite catalysis. We report the interdependence of coke nature and location with its true character in the mechanisms of ethylene oligomerization: a model zeolite catalyzed transformation involved in many sustainable processes. We prepared, characterized, and tested ZSM-5 zeolites of different diffusion paths and acidities, using polymeric-, organic-template, or template-free strategies and various Si/Al ratios. The results indicate that coke can improve the selectivity/yield of higher olefins and jet-fuel aliphatics, and this positive effect is better than modifying the number of acid sites. The molecular-level nature of these coke species is elucidated using high-resolution mass spectrometry. The “enhancer” character of the coke can be better exploited in polymeric templated (hierarchical) ZSM-5 zeolite because mesopores retain coke without critically affecting accessibility or causing deactivation. Furthermore, this catalyst is stable for at least 74 h on stream and in multiple reaction-regeneration cycles.

Original languageEnglish (US)
Article number121582
JournalApplied Catalysis B: Environmental
Volume316
DOIs
StatePublished - Nov 5 2022

Bibliographical note

Funding Information:
This work was supported by the King Abdullah University of Science and Technology (KAUST).

Publisher Copyright:
© 2022 Elsevier B.V.

Keywords

  • alkene
  • catalyst deactivation
  • ethene oligomerization
  • hierarchical zeolite
  • MFI structure

ASJC Scopus subject areas

  • Catalysis
  • General Environmental Science
  • Process Chemistry and Technology

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