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Use your smartphone to scan this QR code and download this article ABSTRACT Introduction: Transfer hydrogenation is one of the reaction of high industrial applications, and copper catalyst is widely used in various hydrogenated substrates. Unfortunately, these hydrogenated processes were usually performed at high temperature, pressure, and a high concentration of catalyst. In this study, we have tried to reduce the dangerous condition by using copper nanoparticles as a catalyst, and the catalytic activity will be evaluated via the transfer hydrogenation of benzaldehyde. These results will be presented in this report. Methods: All the prepared catalysts were characterized by Scanning ElectronMicroscope (SEM), Transmission ElectronMicroscopy (TEM), X-ray diffraction (XRD), atomic absorption spectrometric (AAS), and Nitrogen adsorptiondesorption isotherms (BET). Results: Copper nanoparticles were synthesized via the reduction of copper salt and sodium borohydride. The particle size of copper was determined at 14-16 nm, and copper nanoparticles were well dispersed on the supports. Besides, copper nanoparticles have proved the active catalyst for transfer hydrogenation of benzaldehyde at low atmospheric pressure and temperature. Indeed, 97.8% conversion of benzaldehyde was observed within 60 min in activated carbon-supported copper nanoparticles as a catalyst. Conclusion: The lower concentration of copper particles in supports, the lower catalytic activity of transfer hydrogenation of benzaldehyde was observed. Namely, the conversion of benzaldehyde decreased to 72.7% in the case of Cu-Al2O3, which was anchored 2.80% of copper according to AAS.

Transfer hydrogenation of benzaldehyde over embedded copper nanoparticles