Abstract
The catalytic activity of Pd core–porous SiO2 shell catalysts (Pd@SiO2) with different Pd particle size was evaluated for the direct synthesis of hydrogen peroxide from hydrogen and oxygen. In the synthesis of palladium nanoparticles, the Pd particle size increased with the decrease of the ratio of polyvinylpyrrolidone (PVP) to Pd. Among the prepared Pd@SiO2 catalysts, Pd@SiO2_PVP2 (Pd loading = 1.02 wt%; PVP to Pd precursor molar ratio = 2) had the largest Pd particle size (4.2 nm) and showed the highest hydrogen peroxide production rate (330 mmol H2O2/gPd·h). The production rate of hydrogen peroxide decreased along with the decrease in Pd particle size. As the Pd nanoparticles became smaller, energetic sites (defects, edges, and corners) where the O–O bond is dissociated and the formation of water is promoted were more exposed on the surface. Thus, fewer energetic sites on the Pd surface are favored for synthesizing hydrogen peroxide, which was the major reason for Pd@SiO2_PVP2 being the most active among the prepared Pd@SiO2 catalysts.
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Acknowledgments
This work was supported by the Human Resources Development program (No. 20114010203050) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korean government Ministry of Trade, Industry and Energy. This work was supported by the National Research Foundation of Korea Grant funded by the Korean Government (Ministry of Science, ICT & Future Planning)” (2013, University-Institute Cooperation Program). Dr. Dae-Won Lee was supported by a Korea University Grant.
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Kim, S., Lee, DW., Lee, KY. et al. Effect of Pd Particle Size on the Direct Synthesis of Hydrogen Peroxide from Hydrogen and Oxygen over Pd Core–Porous SiO2 Shell Catalysts. Catal Lett 144, 905–911 (2014). https://doi.org/10.1007/s10562-014-1235-3
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DOI: https://doi.org/10.1007/s10562-014-1235-3