Effect of Pd particle size on the direct synthesis of hydrogen peroxide from hydrogen and oxygen over Pd core-porous SiO2 shell catalysts

Seongmin Kim, Dae Won Lee, Kwan Young Lee, Eun Ae Cho

Research output: Contribution to journalArticle

27 Citations (Scopus)

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@SiO 2 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 H 2O2/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@SiO 2 catalysts.

Original languageEnglish
Pages (from-to)905-911
Number of pages7
JournalCatalysis Letters
Volume144
Issue number5
DOIs
Publication statusPublished - 2014 Jan 1

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Hydrogen peroxide
Hydrogen Peroxide
Hydrogen
Particle size
Oxygen
Povidone
Catalysts
Nanoparticles
Palladium
Catalyst activity
Defects
Water

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Cite this

Effect of Pd particle size on the direct synthesis of hydrogen peroxide from hydrogen and oxygen over Pd core-porous SiO2 shell catalysts. / Kim, Seongmin; Lee, Dae Won; Lee, Kwan Young; Cho, Eun Ae.

In: Catalysis Letters, Vol. 144, No. 5, 01.01.2014, p. 905-911.

Research output: Contribution to journalArticle

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AB - 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@SiO 2 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 H 2O2/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@SiO 2 catalysts.

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