Direct Synthesis of Pure Aqueous H₂O₂ Solution within Aluminosilicate Zeolite Crystals

The synthesis of H₂O₂ generally requires multiple mixed organic solvents and/or halide additives, causing complexity in purification. Herein, we overcome this problem by direct synthesis of H₂O₂ in aqueous solution using AuPd nanoparticles fixed within the aluminosilicate zeolite crystals as a catalyst. The AuPd nanoparticles catalyzed the oxygen hydrogenation to form H₂O₂ in zeolite crystals via a zeolite-assisted proton transfer process. In addition, the protons also stabilize the H₂O₂ product against the deprotonation that causes H₂O₂ decomposition. The H₂O₂ productivity reached 320 mmol g_AuPd^–1 h^–1 with a H₂ selectivity of 88% in water, showing significant advances compared with the conventionally supported metal nanoparticle catalysts. These findings highlight the zeolite fixed structure that offers a new way for designing efficient catalysts in H₂O₂ synthesis.