Oxidation of Ethanol to Acetic Acid by Supported PtCu Nanoparticles Stabilized by a Diamine Ligand

Abstract

Diamine-capped PtCu nanoparticles have been synthesized by the simultaneous reduction of the corresponding bis-imine metal complexes with hydrogen and supported onto a high-surface-area carbon. The obtained heterogeneous catalyst was tested in thermally conducted aerobic oxidation of ethanol to acetic acid in water as well as in the electrochemical oxidation of ethanol. Both types of catalyses mediated by the PtCu alloy confirmed a notable increase in catalytic activity compared to the pure Pt- and Cu-based counterparts due to a clear bimetallic effect.

Recent Advances of PtCu Alloy in Electrocatalysis: Innovations and Applications

“…It exhibited good stability at 0.45 V for 1200 s, maintaining specific activity and mass activity of 0.25 mA cm −2 and 124 mA mg −1 , respectively. Oberhauser et al synthesized Diamine-stabilized PtCu nanoparticles featuring a Pt:Cu (1:1) core and a Cu-enriched surface (Pt:Cu, 1:2) via the simultaneous reduction of a 1:1 mixture of Pt(II) and Cu(II) bisimine complexes using hydrogen [117]. The diamine ligand, with C 16 -alkyl chains, exhibits strong hydrophobic properties and interacts through secondary amine functionalities with surface Pt(0) and M(II)-OH (M = Pt, Cu) sites, catalyzing EOR to acetic acid with exceptionally low Pt loading of 0.34 wt%.…”

One-Step Hydrothermal/Solvothermal Preparation of Pt/TiO2: An Efficient Catalyst for Biobutanol Oxidation at Room Temperature

“…In current research, the reaction temperatures for activated alcohols [7,18,19] typically fall within the range of 25-90 • C. The alcohol-to-metal molar ratios in these reactions vary from 200 to 8000, and turnover frequencies (TOFs) typically range from 200 to 12,000 h −1 . In contrast, reactions involving non-activated aliphatic alcohols [3,[20][21][22][23] typically occur at temperatures between 55 and 160 • C. The alcohol-to-metal molar ratios in these reactions range from 10 to 2000, and the TOF values, which are roughly estimated based on the corresponding activity, generally fall between 2 and 500 h −1 .…”

“…The leaching of the basic sites was not significant after two cycles of the catalysts. Wang [25] and Oberhanser [23] and their co-workers complexed pyrrolidone and diamine with metal particles to enhance the catalytic activity of alcohols, respectively. The ligand modification increased the alcohol oxidation activity by more than 30%.…”