Influence of Intracrystalline Ionic Strength in MFI Zeolites on Aqueous Phase Dehydration of Methylcyclohexanols

Lara Milaković, Peter H. Hintermeier, Yue Liu, Eszter Baráth, Johannes A. Lercher

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The impact of the concentration of hydrated hydronium ions and in turn of the local ionic strength in MFI zeolites has been investigated for the aqueous phase dehydration of 4-methylcyclohexanol (E1 mechanism) and cis-2-methylcyclohexanol (E2 mechanism). The E2 pathway with the latter alcohol led to a 2.5-fold higher activity. The catalytic activity normalized to the hydronium ions (turnover frequency, TOF) passed through a pronounced maximum, which is attributed to the increasing excess chemical potential of the alcohols in the pores, increasing in parallel with the ionic strength and the additional work caused by repulsive interactions and charge separation induced by the bulky alcohols. While the maximum in rate observed is invariant with the mechanism or substitution, the reaction pathway is influencing the activation parameters differently.

Original languageEnglish
Pages (from-to)24806-24810
Number of pages5
JournalAngewandte Chemie International Edition in English
Volume60
Issue number47
DOIs
StatePublished - 15 Nov 2021

Keywords

  • alcohol dehydration
  • cyclic alcohols
  • ionic strength
  • volcano
  • zeolites

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