Catalytic Performances of Au-Pt Nanoparticles on Phosphorous Functionalized Carbon Nanofibers towards HMF Oxidation

Herein, we reported the utilization of pre-formed Au-Pt nanoparticles deposited on phosphorus functionalized carbons as effective catalysts for the oxidation of 5-hydroxymethylfurfural (HMF) to furandicarboxylic acid (FDCA). Au-Pt nanoparticles have been prepared by a two-step methodology using polyvinyl alcohol (PVA) as protective agent and a combination of NaBH4 and H-2 as reducing agents. Three carbon nanofibers (CNFs) with different graphitization degrees have been functionalized through treatment with an H3PO4-HNO3 mixture at 150 degrees C, in order to incorporate P groups on carbon surface. Surface and structural properties of the synthesized functionalized materials have been investigated by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The structural and surface properties of carbon nanofibers determine the amount of P-functionalities, which is a key parameter affecting the catalytic performances of Au-Pt. Indeed, the highest activity and stability has been achieved for Au-Pt deposited on the sample, which showed the largest amount of P-groups on the surface.