Direct synthesis of hydrogen peroxide from hydrogen and oxygen over Pd/CsXH3−XPW12O40/MCF (X = 1.7, 2.0, 2.2, 2.5, and 2.7) catalysts

Palladium catalysts supported on CsXH3−XPW12O40/MCF (Pd/CsXPW/MCF (X = 1.7, 2.0, 2.2, 2.5, and 2.7)) were prepared with a variation of cesium content (X), and they were applied to the direct synthesis of hydrogen peroxide from hydrogen and oxygen. Conversion of hydrogen over Pd/CsXPW/MCF catalysts showed no great difference, while selectivity for hydrogen peroxide and yield for hydrogen peroxide over the catalysts showed volcano-shaped curves with respect to cesium content. Acidity of Pd/CsXPW/MCF catalysts also showed a volcano-shaped trend with respect to cesium content. It was revealed that yield for hydrogen peroxide increased with increasing acidity of Pd/CsXPW/MCF catalysts. Among the catalysts tested, Pd/Cs2.5PW/MCF catalyst with the largest acidity showed the highest yield for hydrogen peroxide. It is concluded that Pd/CsXPW/MCF efficiently served as an alternate acid source and as an active metal catalyst in the direct synthesis of hydrogen peroxide.

Graphical abstractIn the direct synthesis of hydrogen peroxide from hydrogen and oxygen over Pd/CsXPW/MCF catalysts, yield for hydrogen peroxide increased with increasing acidity of the catalysts.Figure optionsDownload full-size imageDownload high-quality image (100 K)Download as PowerPoint slideHighlights► Direct synthesis of hydrogen peroxide from hydrogen and oxygen was conducted. ► Palladium catalyst supported on CsXH3−XPW12O40/MCF was used. ► Acidity of Pd/CsXH3−XPW12O40/MCF catalyst played an important role. ► Yield for hydrogen peroxide increased with increasing acidity of the catalyst.