Metallic short fibers for liquid-phase oxidation reactions

The application of metallic short fibers (MSF) for the liquid phase oxidation of alcohols and the epoxidation of alkenes has been investigated. Screening of various MSF lead to the conclusion that Cu3Sn- and Cu64Ni28Mn7Fe1-fibers are the most promising candidates for oxidation reactions. Due to increased decomposition of H2O2 in presence of MSF containing Pt, Pd or Rh, lower yields were obtained with these catalysts. Oxidation reactions with the two above mentioned MSF are characterized by high selectivities for the oxidation of primary and secondary alcohols to the corresponding aldehydes and ketones, respectively. Reactions are independent from reaction atmosphere and H2O2-dosage protocol, whereas parameters like solvent, temperature, and oxidant concentration had a significant influence.

The application of metallic short fibers – processed by melt extraction process – as catalysts for the selective heterogeneously catalyzed reaction of alcohols has been assessed.Figure optionsDownload high-quality image (331 K)Download as PowerPoint slideResearch highlights▶ The production of metallic short fibers (MSF) is a straightforward process. ▶ MSF are potent catalysts for chemoselective liquid-phase alcohol oxidation. ▶ Oxidation is possible with the environmentally friendly oxidant hydrogen peroxide. ▶ Cu3Sn intermetallic phase was identified as the material with the most promising properties. ▶ The scope of reactions is extended to liquid-phase epoxidation of olefinic double bonds.