A novel route for in-situ H2O2 generation from selective reduction of O2 by hydrazine using heterogeneous Pd catalyst in an aqueous medium

Abstract

Hydrogen peroxide in high yields can be generated with high efficiency at mild conditions (25 °C and atmospheric pressure) with the formation of only environment-friendly by-products (N₂ and H₂O) by a reduction of O₂ by hydrazine from its hydrate/salt with its complete conversion in a short reaction period (≤0.5 h) using a easily separable supported Pd catalyst (Pd/Al₂O₃, Pd/Ga₂O₃ or Pd/C) in an acidic aqueous medium in the presence of bromide anions; the presence of both acid (protons) and bromide anions is essential for the selective reduction of O₂ by hydrazine to H₂O₂ and in their absence, the reaction leads only to the formation of water.