Direct synthesis of H2O2 from H2 and O2 over Pd catalyst supported on Cs2.5H0.5PW12O40-MCF silica

Abstract

Palladium catalysts supported on Cs2.5H0.5PW12O40-incorporated MCF silica (Pd/CsPW-MCF-X (X=14.3, 21.8, 28.1, 33.4, and 38.0)) were prepared with a variation of Cs2.5H0.5PW12O40 content (X, wt.%). The prepared catalysts were then applied to the direct synthesis of hydrogen peroxide from hydrogen and oxygen. Selectivity for hydrogen peroxide and yield for hydrogen peroxide over Pd/CsPW-MCF-X catalysts showed volcano-shaped curves with respect to Cs2.5H0.5PW12O40 content. Acidity of the catalysts also showed a volcano-shaped trend with respect to Cs2.5H0.5PW12O40 content. It was revealed that yield for hydrogen peroxide increased with increasing acidity of Pd/CsPW-MCF-X catalyst. Pd/CsPW-MCF-X efficiently served as an alternate acid source and as an active metal catalyst in the direct synthesis of hydrogen peroxide from hydrogen and oxygen.