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

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.

Graphical abstractIn the direct synthesis of hydrogen peroxide from hydrogen and oxygen over palladium catalysts supported on Cs2.5H0.5PW12O40-incorporated MCF silica, yield for hydrogen peroxide increased with increasing acidity of the catalyst.Figure optionsDownload full-size imageDownload high-quality image (104 K)Download as PowerPoint slideHighlights► Direct synthesis of hydrogen peroxide from hydrogen and oxygen was conducted. ► Palladium catalysts supported on Cs2.5H0.5PW12O40-incorporated MCF silica were used. ► Acidity of the catalyst played an important role. ► Yield for hydrogen peroxide increased with increasing acidity of the catalyst.