Direct Synthesis of Hydrogen Peroxide from Hydrogen and Oxygen over Pd-supported Metal-Organic Framework Catalysts

摘要

Pd-supported metal-organic framework (MOF) catalysts have been applied for the direct synthesis of H2O2 from H-2 and O-2 under intrinsically safe and noncorrosive reaction conditions. The catalytic performance was strongly governed by the properties of the support materials, and the BrOnsted acid sites newly introduced on the organic linkers of MOF were proven to be more effective than the Lewis acid sites on the open metal sites in enhancing the H2O2 formation and suppressing its decomposition. Pd/MIL-101-SO3H was highly efficient in promoting the reaction owing to the contribution from the strong acidity and highly porous nature of the robust MOF support used. The hydrogen peroxide productivity of Pd/MIL-101-SO3H catalyst reached 361mmol H2O2 mmol/Pd/h, which was 2.3 or 1.7 times higher than that of the conventional Pd/HBEA (SAR=25) or Pd/sulfonated resin catalyst, respectively. This result clearly demonstrates the promising potential of MOF as a solid acid support material.