Kim, Seongmin Lee, Dae-Won Lee, Kwan-Young Cho, Eun Ae 2024-01-20T10:00:21Z 2024-01-20T10:00:21Z 2022-01-25 2014-05 1011-372X https://pubs.kist.re.kr/handle/201004/126806 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/g(Pd)center dot 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. English SPRINGER Effect of Pd Particle Size on the Direct Synthesis of Hydrogen Peroxide from Hydrogen and Oxygen over Pd Core-Porous SiO2 Shell Catalysts Article 10.1007/s10562-014-1235-3 1 CATALYSIS LETTERS, v.144, no.5, pp.905 - 911 CATALYSIS LETTERS 144 5 905 911 N scie scopus 000334443200017 2-s2.0-84901841761 Chemistry, Physical Chemistry Article NANOCRYSTALS NANOPARTICLES DISSOCIATION H2O2 O-2 H-2 Direct hydrogen peroxide synthesis Palladium catalyst Core-shell structured catalyst Palladium nanoparticle Colloidal method