Pd-Al/AC Catalysts for Direct Synthesis of H2O2 with High Productivity

In this study, activated carbon (AC) supported Pd and PdAl bimetallic catalysts were prepared and tested for direct synthesis of hydrogen peroxide (H2O2). The PdAl/AC catalyst showed higher H2O2 productivity (80 mol H2O2 kg(cat)(-1) h(-1)) than Pd/AC catalyst. The characterization results indicated that the addition of Al not only enhanced the content of Pd-II, but also increased the dispersion of Pd. In PdAl/AC catalysts, Pd was finely dispersed on carbon surface and consisted entirely of the adsorbed PdCl2. It is expected that the increase in the dispersion of Pd and the content of Pd-II in the fresh catalyst is critical for the improvement of H2O2 production.