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Abstract
This study reports a developed process which is a general and facilemethod for the oxidation of benzyl alcohol (BnOH) compounds to the benzaldehyde (BA)derivatives, under mild conditions. The oxidation of BnOH species catalyzed byPtNi@SWCNT in toluene (3 ml) at 80 °C under a continuous stream ofO2. Single wall carbon nanotube supported PtNi(PtNi@SWCNT) nanoparticles were synthesized using a single-step modified reductionprocess. The characterization of PtNi@SWCNT nanocatalyst was performed bytransmission electron microscope (TEM), X-ray diffraction (XRD), X-ray PhotoelectronSpectroscopy (XPS), and elemental analysis by ICP-OES. A variety of BnOH compoundswere oxidized by the PtNi@SWCNT catalyst and all the expected oxidation productswere obtained in high efficiency in 2 hours of reaction time. TLC was used tomonitoring the reaction progress, and the products were identified by1H/13C-NMRanalysis.
Highlights
transmission electron microscope (TEM) images of PtNi@Single-walled carbon nanotubes (SWCNT) nanoparticles have been obtained by a JEOL 200 kV TEM instrument. 1H and 13C NMR spectra were recorded on a Jeol ECS 400 MHz spectrometer
The crystalline structure of the PtNi@SWCNT was investigated by X-ray diffraction (XRD) analysis (Fig. 1)
PtNi@SWCNT nanoparticles are a promising material for utilization as a catalyst for alcohol oxidation, which is easy to synthesize, have a large surface area, and excellent catalyst properties
Summary
It is necessary to develop less expensive Pt-based catalysts and improve its overall catalytic performance. Graphene oxide supported γ-MnO2 nanocomposites[23], metal oxide supported gold nanoparticles[15,24], and hydroxyapatite-supported palladium nanoclusters[25] have been used as heterogeneous catalysts for the oxidation of BnOH compounds to benzaldehyde derivatives. Due to some disadvantages of commonly used support materials, there is still a need for performing new researches to develop novel nanostructured carbon-based catalysts with good chemical and physical properties. Single-walled carbon nanotubes (SWCNT) as a support material for metal catalysts are favorable due to their high mechanical strength, stability, high surface to volume ratio, and selectivity[26]. A variety of BnOH mixtures were tested by PtNi@SWCNT nanoparticles as a catalyst. All the expected oxidation products were achieved by the very high selectivity (up to 100%) in short reaction times of about 2 hours
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