Oxidation of Benzyl Alcohol Compounds in the Presence of CarbonHybrid Supported Platinum Nanoparticles (Pt@CHs) in Oxygen Atmosphere

Haydar Göksu,Sibel Demiroğlu Mustafov,Hakan Burhan,Fatih Şen

doi:10.1038/s41598-020-62400-5

Haydar Göksu, Sibel Demiroğlu Mustafov + Show 2 more

Open Access

https://doi.org/10.1038/s41598-020-62400-5

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Journal: Scientific Reports	Publication Date: Mar 25, 2020
Citations: 37	License type: open-access

Affiliation: Duzce University, Dumlupinar University

Abstract

A novel catalyst which carbon hybrid supported platinum nanoparticleswere synthesized by our group for the oxidation of benzyl alcohol derivatives. Inthis study, this catalyst was utilized for the oxidation of benzyl alcoholderivatives to benzaldehyde compounds in aqueous toluene at 80 °C. The benzaldehydederivatives were synthesized in high yields and mild conditions in the presence ofthe catalyst by the developed method. Additionally, the prepared nanoparticles havebeen characterized by Transmission Electron Microscopy (TEM), the high-resolutionelectron micrograph (HR-TEM), X-ray Photoelectron Spectroscopy (XPS), and X-rayDiffraction (XRD). The mean particle size of the nanoparticles determined by the XRDtechnique was found to be 2.83 nm in parallel with TEM analysis. TEM analysis alsoindicated that the Pt nanoparticles were evenly dispersed on the support material.Finally, the Pt@CHs catalyst was shown also stable and reusable for the oxidationreaction, providing ≤95% conversion after its 3rd consecutive use in the oxidationreaction of various compounds.

Highlights

Platinum (Pt) nanoparticles are usually recognized as efficient catalysts for reactions of alcohol oxidation because of their capability to activate molecular oxygen and the C–H bonds of alcohol[19,20,21]
PtCl4 (99% Alfa Aesar), lithium triethylborohydride (1.0 M dissolved in THF, Sigma Aldrich), dimethylamine borane ((CH3)2NHBH3) (Sigma Aldrich), tetrahydrofuran (THF) (99.5%, Merck), diphenylamine, and triphenylamine (Sigma Aldrich) were used as received from suppliers and all benzyl alcohol compounds tested in the oxidation reactions were purchased from Sigma-Aldrich
HR-Transmission Electron Microscopy (TEM) images with high resolution have been obtained, showing that there is no agglomeration in nanoparticles and most of them are formed in spherical form

Summary

Introduction

Platinum (Pt) nanoparticles are usually recognized as efficient catalysts for reactions of alcohol oxidation because of their capability to activate molecular oxygen and the C–H bonds of alcohol[19,20,21]. In this work, carbon hybrids-supported Pt nanoparticles were used for the synthesis of various aldehydes with the oxidation of benzyl alcohol compounds at 80 °C and under molecular oxygen. The catalytic activity of the Pt@CHs was studied for the selective oxidation of benzyl alcohols to benzaldehyde in the presence of oxygen gas, in the presence and absence of a base (Table 1).

Results

Conclusion