SCILLs as selective catalysts for the oxidation of aromatic alcohols

Iunia Podolean, Octavian D. Pavel, Haresh G. Manyar, S. F.Rebecca Taylor, Kathryn Ralphs, Peter Goodrich, Vasile I. Pârvulescu*, Christopher Hardacre

*Corresponding author for this work

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Abstract

The cryptomelane form of manganese oxide, OMS-2, has been used a pure material as well as a 5 wt % Pt/OMS-2 catalyst for the oxidation of benzyl alcohol. In addition, these catalysts have been modified with ionic liquids via a thin layer of [Bmim][NTf2] or [Bmpyr][NTf2]. These catalysts were characterized using a series of techniques: NMR, XRD, DRIFT, Raman, BET, Dynamic Light Scattering, XPS, TEM, SEM. The Weisz–Prater criterion has also been considered to inform whether the reactions were under diffusional control. The presence of platinum on the OMS-2 surface results in the support transforming to form Mn3O4 during reaction. In contrast, in the presence of the ionic liquid, the catalysts exhibited an increased phase stability. Efficient oxidation of benzyl alcohol was observed with a conversion of 80% and 82% selectivity to aldehyde for 5 wt% Pt/OMS-2/[Bmim][NTf2] in air. As expected an increase of the oxygen pressure led to an increase in the conversion to the detriment of aldehyde selectivity. The catalytic tests also showed an important effect on the conversion and selectivity of benzyl alcohol as a function of the diluent gas comparing inert (N2, He, Ar) or (CO2) reactive gases. This effect was influenced by the nature of the ionic liquid present.

Original languageEnglish
Number of pages7
JournalCatalysis Today
Early online date05 Jul 2018
DOIs
Publication statusEarly online date - 05 Jul 2018

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Benzyl Alcohol
Ionic Liquids
Alcohols
Ionic liquids
Oxidation
Catalysts
Aldehydes
Noble Gases
Manganese oxide
Phase stability
Dynamic light scattering
Inert gases
Platinum
X ray photoelectron spectroscopy
Gases
Nuclear magnetic resonance
Oxygen
Transmission electron microscopy
Scanning electron microscopy
Air

Keywords

  • Benzaldehyde
  • Benzyl alcohol
  • Ionic liquids
  • OMS-2
  • Oxidation
  • Pt
  • SCILL

Cite this

Podolean, Iunia ; Pavel, Octavian D. ; Manyar, Haresh G. ; Taylor, S. F.Rebecca ; Ralphs, Kathryn ; Goodrich, Peter ; Pârvulescu, Vasile I. ; Hardacre, Christopher. / SCILLs as selective catalysts for the oxidation of aromatic alcohols. In: Catalysis Today. 2018.
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SCILLs as selective catalysts for the oxidation of aromatic alcohols. / Podolean, Iunia; Pavel, Octavian D.; Manyar, Haresh G.; Taylor, S. F.Rebecca; Ralphs, Kathryn; Goodrich, Peter; Pârvulescu, Vasile I.; Hardacre, Christopher.

In: Catalysis Today, 05.07.2018.

Research output: Contribution to journalArticle

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AU - Podolean, Iunia

AU - Pavel, Octavian D.

AU - Manyar, Haresh G.

AU - Taylor, S. F.Rebecca

AU - Ralphs, Kathryn

AU - Goodrich, Peter

AU - Pârvulescu, Vasile I.

AU - Hardacre, Christopher

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