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 language | English |
|---|---|
| Pages (from-to) | 24806-24810 |
| Number of pages | 5 |
| Journal | Angewandte Chemie International Edition in English |
| Volume | 60 |
| Issue number | 47 |
| DOIs | |
| State | Published - 15 Nov 2021 |
Keywords
- alcohol dehydration
- cyclic alcohols
- ionic strength
- volcano
- zeolites