Effect of reactant density inside supercages of zeolite La,Na-Y on the mechanism of the ethylbenzene conversion

Yijiao Jiang, Jun Huang*, Michael Hunger

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Zeolites La,Na-Y are important catalysts for industrial FCC units due to their acidic properties and stability. The ethylbenzene disproportionation on this zeolite was suggested as a standard test reaction for acidic zeolites by the Catalysis Commission of the International Zeolite Association (IZA). The present work provides solid-state 13C NMR spectroscopic evidence that various amounts of reactants inside the supercages of zeolites La,Na-Y obviously affect the catalytic behavior of ethylbenzene reaction. At 453 K, diphenylethane was only detected on zeolite La,Na-Y with three ethylbenzene molecules per supercage. This intermediate, however, did not occur on samples with low loading (1 or 2 EB molecules per supercage). On zeolite La,Na-Y loaded with one molecule ethylbenzene per supercage, dealkylation and realkylation of ethylbenzene occurred at 548 K without any side-reactions. However, side-reactions of oligomerization, hydride transfer, and aromatization were observed on samples with high ethylbenzene loading, which promotes the catalyst deactivation. In addition, the zeolites La,Na-Y with high loadings of ethylbenzene show a higher reactivity and more complex reaction mechanisms.

Original languageEnglish
Pages (from-to)119-123
Number of pages5
JournalCatalysis Today
Volume164
Issue number1
DOIs
Publication statusPublished - 30 Apr 2011
Externally publishedYes

Keywords

  • Acid catalyzed reaction
  • Ethylbenzene disproportionation
  • Reaction mechanism
  • Solid-state NMR spectroscopy
  • Zeolite La,Na-Y

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